共查询到20条相似文献,搜索用时 15 毫秒
1.
C. den Hartog J. Hennen Th. M. P. A. Noten R. J. van Wijk 《Plant Systematics and Evolution》1987,156(1-2):55-59
The chromosome numbers of the five European seagrasses have been determined in material from several sites along the coasts of the Atlantic Ocean, the North Sea and the Mediterranean:Zostera marina L., 2n = 12;Z. noltii
Hornem., 2n = 12;Posidonia oceanica (L.)Delile, 2n = 20;Cymodocea nodosa (Ucria)Aschers., 2n = 14, 2n = 28;Halophila stipulacea (Forsk.)Aschers., 2n = 18. The difference in chromosome morphology betweenZ. marina andZ. noltii supports the division of the genus into two subgenera. 相似文献
2.
Juliette Contandriopoulos 《Plant Systematics and Evolution》1978,129(4):277-289
The author has proceeded with a cytotaxonomical study of the genusSideritis L. Chromosome numbers (mostly new) are reported for about twenty taxa from sectionEmpedoclea (Rafin.)Benth. This section occupies a very isolated position within the genus and has evolved quite independently. 相似文献
3.
Gerhard Pils 《Plant Systematics and Evolution》1980,136(1-2):73-124
The biosystematics of theFestuca violacea group (F. rubra subsp.violacea sensuHackel) in the Eastern Alps is studied.F. picturata
Pils (=F. picta
Kit. exSchultes nonJ. F. Gmelin) is confirmed as diploid, whereas the chromosome numbers forF. nitida (diploid),F. puccinellii (hexaploid), andF. norica (diploid, tetraploid and hexaploid) are reported for the first time. Details of morphology, leaf anatomy, and epidermal structures now allow a better separation of these species; new maps illustrate their distribution. Karyological, chorological, morphological, and anatomical data form the basis for a discussion of the phylogeny of theF. violacea group and its position withinF. rubra s. latiss. 相似文献
4.
Veronica lycica
Lehm. is a distinct, diploid member of theVeronica cymbalaria group, endemic in Lycia (S.W. Anatolia). Closely related is the newV. stamatiadae
M. Fischer etW. Greuter which is also diploid and seems to be restricted to the small Greek island Ro close to the South coast of Lycia. The chromosome numbers for both species are reported for the first time (2n = 18).
Untersuchungen über den PolyploidkomplexVeronica cymbalaria agg., II. — Der erste Beitrag dieser Serie:Fischer (1975). 相似文献
5.
Kristina A. Schierenbeck G. Ledyard Stebbins Robert W. Patterson 《Plant Systematics and Evolution》1992,179(3-4):187-205
The central Sierran tetraploidArctostaphylos mewukka
Merriam has been reported to be an allopolyploid originating from the diploid species,A. patula
Greene and eitherA. viscida subsp.viscida
Parry orA. viscida subsp.mariposa (Dudley)P. V. Wells, although without conclusive evidence. Morphometrics and the verification and determination of chromosome numbers were used to substantiate the evolutionary relationships among these species. A closely related species,Arctostaphylos truei
Knight, was also examined using these methods to determine its separability fromA. mewukka. The morphometric analyses support a hypothesis for a polyphyletic origin ofA. mewukka from different races ofA. viscida andA. patula. The chromosomal data, although inclusive, also support this hypothesis. The data do not support the recognition ofA. truei as a taxonomic entity separate fromA. mewukka at the species level. 相似文献
6.
Olof Ryding 《Plant Systematics and Evolution》1993,185(1-2):91-97
The two generaPlectranthus andIsodon are compared and found to be very dissimilar.Isodon ist considered to be misplaced inOcimeae subtribePlectranthinae and apparently is more closely related to subtribeHyptidinae. The disjunct genusRabdosiella is compared to these two genera and regarded to be polyphyletic. The AfricanR. calycina (Benth.)Codd is returned toPlectranthus and calledP. calycinus
Benth., while the AsianR. ternifolia (D. Don)Codd is placed inIsodon sect.Pyramidium and calledI. ternifolius (D. Don)Kudo. 相似文献
7.
Mats Wedin 《Plant Systematics and Evolution》1993,187(1-4):213-241
A phylogenetic analysis of the familySphaerophoraceae (Caliciales, lichenized ascomycetes) has resulted in a new generic classification. Notes on character evolution are given. The generaSphaerophorus s. str.,Bunodophoron andLeifidium, gen. nov., are accepted.Pleurocybe andPseudosphaerophorus are considered synonyms ofBunodophoron andThysanophoron is considered synonym toSphaerophorus. The following new combinations are proposed:Bunodophoron coomerense (Ohlsson)Wedin,B. diplotypum (Vain.)Wedin,B. dodgei (Ohlsson)Wedin,B. flaccidum (Kantvilas & Wedin)Wedin,B. formosanum (Zahlbr.)Wedin,B. imshaugii (Ohlsson)Wedin,B. insigne (Laurer)Wedin,B. kinabaluense (M. Satô)Wedin,B. macrocarpum (Ohlsson)Wedin,B. madagascareum (Nyl.)Wedin,B. microsporum (Ohlsson)Wedin,B. murrayi (Ohlsson)Wedin,B. notatum (Tibell)Wedin,B. ohlssonii (Wedin)Wedin,B. patagonicum (C. W. Dodge)Wedin,B. ramuliferum (I. M. Lamb)Wedin,B. scrobiculatum (C. Bab.)Wedin,B. tibellii (Wedin)Wedin,B. whakapapaense (Wedin)Wedin, andLeifidium tenerum (Laurer)Wedin. 相似文献
8.
Reinhard Doll 《Plant Systematics and Evolution》1976,125(1):21-27
Taraxacum waltheri
Doll is a new triploid microspecies from sect.Erythrocarpa. Chromosome numbers and pollen conditions are reported, and a distribution map is given for several rare Oriental microspecies. 相似文献
9.
A. Kenton 《Plant Systematics and Evolution》1984,144(3-4):221-240
Three closely related species of theG. linearis group are differentiated by their basic numbers and ploidy levels. The change in basic number involves Robertsonian fusion, but the species also differ by interchange and cryptic structural changes revealed by meiotic pairing in F1 hybrids.Chromosome Evolution in theGibasis linearis Group (Commelinaceae), II.—Part I:Kenton (1981a). 相似文献
10.
David L. Hawksworth 《Plant Systematics and Evolution》1985,149(3-4):303-307
The nomenclatural history of the generic nameParmeliopsis is reviewed. Its correct citation is found to beParmeliopsis (Nyl. exStizenb.)Nyl., dating from 1866, not 1869 as commonly cited, withP. placorodia (Ach.)Nyl. as holotype species. There is consequently no nomenclatural problem to the adoption ofForaminella
Fricke Meyer, typified byF. ambigua (Wulfen)Fricke Meyer for theParmeliopsis species with falcate conidia. A synopsis of the nomenclature of the North American and European species of both these genera is included. 相似文献
11.
Othmar Breuß 《Plant Systematics and Evolution》1985,148(3-4):313-315
Verrucaria schaereri (Fr.)Nyl. is accorded generic status asPlacocarpus
Trev. emend.O. Breuss. The main differences between the two genera concern the thallus anatomy and the spores which are halonate inPlacocarpus. The following new combinations are proposed:Placocarpus schaereri (Fr.)O. Breuss andPlacidiopsis cinerascens (Nyl.)O. Breuss. 相似文献
12.
Reinhard Doll 《Plant Systematics and Evolution》1975,123(3):199-212
A new triploid microspecies ofTaraxacum from sect.Erythrocarpa is described:Taraxacum erzincanense
Doll. In addition, 2x 3x, and 4x chromosome numbers, pollen conditions and chorological facts are reported for serveral other rare Oriental microspecies. 相似文献
13.
Colony counts of acetate-, propionate- and l-lactate-oxidizing sulfate-reducing bacteria in marine sediments were made. The vertical distribution of these organisms were equal for the three types considered. The highest numbers were found just beneath the border of aerobic and anaerobic layers.Anaerobic mineralization of acetate, propionate and l-lactate was studied in the presence and in the absence of sulfate. In freshwater and in marine sediments, acetate and propionate were oxidized completely with concomitant reduction of sulfate. l-Lactate was always fermented. Lactate-oxidizing, sulfate-reducing bacteria, belonging to the species Desulfovibrio desulfuricans, and lactate-fermenting bacteria were found in approximately equal amounts in the sediments. Acetate-oxidizing, sulfate-reducing bacteria could only be isolated from marine sediments, they belonged to the genus Desulfobacter and oxidized only acetate and ethanol by sulfate reduction. Propionate-oxidizing, sulfate-reducing bacteria belonged to the genus Desulfobulbus. They were isolated from freshwater as well as from marine sediments and showed a relatively large range of usable substrates: hydrogen, formate, propionate, l-lactate and ethanol were oxidized with concomitant sulfate reduction. l-Lactate and pyruvate could be fermented by most of the isolated strains. 相似文献
14.
Four very rare species ofAgaricales of dry grassland of the Galgenberg near Röschitz (Niederösterreich) are described and their taxonomy, affinities, ecology and distribution are discussed.Marasmiellus graminis (Murr.)Sing. & Hausknecht andCrinipellis subtomentosa (Peck.)Sing. var.mauretanica (Mre.)Sing. & Hausknecht are proposed as new combinations;Campanella inquilina
Romagn. apudRedhead is a synonym ofC. caesia
Romagn. 相似文献
15.
T. R. Deason P. C. Silva S. Watanabe G. L. Floyd 《Plant Systematics and Evolution》1991,177(3-4):213-219
Komárek has recently reviewed the various species assigned to the green algal genusNeochloris
Starr (Chlorococcales, Chlorococcaceae) and removed those with uninucleate vegetative cells to a new genus,Ettlia.
Watanabe & Floyd, unaware ofKomárek's work, also reviewed the species ofNeochloris and distributed them among three genera—Neochloris, Chlorococcopsis gen. nov., andParietochloris gen. nov.—on the basis of details of the covering of the zoospore and the arrangement of the basal bodies of the flagellar apparatus. This paper reconciles these two treatments and makes additional recommendations at the ranks of genus, family, order, and class. 相似文献
16.
The green algaTrebouxia aggregata (Archibald)Gärtner (Chlorellales) and the procaryotic blue-green alga (cyanobacterium)Gloeocapsa sanguinea (C. Agardh)Kütz. emend.Jaag (Chroococcales) are reported to be the phycobionts inEuopsis granatina (Sommerf.)Nyl. (Lichinaceae). The ultrastructure of the two organisms, studied in the lichen thallus, is described.
Frau Prof. Dr.Elisabeth Tschermak-Woess zu ihrem 70. Geburtstag gewidmet. 相似文献
17.
J. G. Chmielewski C. C. Chinnappa J. C. Semple 《Plant Systematics and Evolution》1990,169(3-4):151-175
Multivariate analysis of vegetative and reproductive characters was used to examine morphological relatedness amongAntennaria alborosea
A. E. Porsild,A. corymbosa
E. Nels.,A. marginata
Greene,A. microphylla
Rydb.,A. parvifolia
Nutt.,A. rosea
Greene, andA. umbrinella
Rydb. Both pistillate and staminate plants were examined. Some of the characters examined were variable in one species, but stable in another (i.e., presence or absence of papillae on the achenes). Our analyses indicate that the seven species are morphologically distinct. It is hypothesized that theA. rosea agamic complex arose through hybridization amongA. corymbosa, A. microphylla, A. umbrinella, and possiblyA. dioica (L.)Gaertn. However, hybridization between the three former species and others, as well as their subsequent morphological responses to different environmental conditions causes confusion in recognizing the taxa.Antennaria angustifolia
Rydb.,A. arida
E. Nels.,A. confinis
Greene,A. scariosa
E. Nels.,A. foliacea humilis
Rydb.,A. concinna
E. Nels., andA. viscidula
E. Nels. are considered to represent F 1 hybrids. 相似文献
18.
5 new taxa are described and illustrated; their position within the subgenus is discussed:T. hirta
W. Till & L. Hromadnik,T. cotagaitensis
L. Hromadnik,T. caliginosa
W. Till, andT. gilliesii
Baker subsp.polysticha
W. Till & L. Hromadnik are members of a group includingT. myosura
Grisebach exBaker,T. mandonii
E. Morren exMez in DC.,T. retorta
Grisebach exBaker em.Grisebach andT. andicola
Gillies exBaker.
T. brealitoensis
L. Hromadnik is related toT. angulosa
Mez in DC. but distinct and possibly of hybrid origin. 相似文献
19.
Ernst Vitek 《Plant Systematics and Evolution》1982,139(3-4):319-322
The following new hybrids are described:Euphrasia ×dilata = E. hirtella
Jordan exReuter ×alpina
Lam.;Euphrasia ×trikoviana = E. tricuspidata L. ×rostkoviana
Hayne. The chromosome number ofEuphrasia tricuspidata L. has been established for the first time: 2n = 22. 相似文献
20.
V. Melzheimer 《Plant Systematics and Evolution》1987,155(1-4):251-256
Silene thebana
Orph. exBoiss. is transferred as a subspecies toS. fabaria (L.)Sm., resulting in the new combinationS. fabaria (L.)Sm. subsp.thebana (Orph. exBoiss.)Melzh. The chromosome count of 2n = 24 is recorded for the first time for this taxon.Dedicated to Prof. DrK. H. Rechinger on the occasion of his 80th birthday, 16th October 1986. 相似文献