Chromosome studies on some Turkish species of Grimmia Hedw.: G. laevigata (Brid.) Brid., G. ovalis (Hedw.) Lindb., G. pulvinata (Hedw.) Sm., G. trichophylla Grev.

In this research, mitotic chromosome numbers in four species of Grimmia Hedw. from Turkey were reported. Mitotic chromosome numbers of three species : Grimmia laevigata (Brid.) Brid. (n = 26), Grimmia ovalis (Hedw.) Lindb. (n = 10), Grimmia pulvinata (Hedw.) Sm. (n = 26) were reported for the first time. Grimmia trichophylla Grev. (n = 13) showed the same chromosome number as in a previous study.     

Re-evaluation of Hymenostylium xanthocarpum (Hook.) Brid., and Ardeuma R.H.Zander & Hedd., a new name for all other species of Hymenostylium (Pottiaceae,Bryophyta)

The Old World Hymenostylium xanthocarpum, the generitype of Hymenostylium, was found to be unrelated to the widespread H. recurvirostrum and other species currently placed in the genus. Major distinguishing traits of H. xanthocarpum are the presence of a stem central strand, leaves broadest about midleaf and constricted just above the base, distal laminal cells usually ventrally bulging and massively unipapillose, and basal cells differentiated only in the lower 1/5–1/7 of the leaf. A new genus name, Ardeuma, is proposed for the remaining species of Hymenostylium, and combinations are made for those that are commonly recognized. A key to Tuerckheimia species in the New World that may be confused with H. xanthocarpum is provided.     

Homaliodendron decompositum (Brid.) Wagn. reduced to synonymy with H. flabellaturn (Sm.) Fleisch

Abstract

Four small moss families found in Malawi are reviewed, and keys are provided to all taxa known in Malawi (and usually to all known in Africa). Regmatodontaceae is shown to contain only one species in Africa, but both known species are keyed. Rhachitheciaceae, contains three genera in Africa (which are keyed), only one of which occurs in Malawi, and for this genus a key is provided for all three African species. Rhacocarpaceae contains only two species in Africa, which are keyed, only one of which is known from Malawi. Rhizogoniaceae contains two genera and three species in Africa.     

A Note on Acrocladium trifarium (W. & M.) Richards & Wallace in Ireland

Abstract

Chains of 3–4-celled gemmae have been observed on the protonema of Trematodon brevicalyx, both in nature as well as in cultures. They are produced in abundance and may help in its survival, propagation and wide dispersal.     

UeberPotentilla Bouquoiana Knaf. und ihre Verwandten: (P. recta L.,P. pilosa W.,P. chrysantha Trev.,P thuringiaca Bernh.,P. intermedia L. undP. parviflora Gaud.)

Ohne Zusammenfassung     

Morphological and cytogenetical characterization of Vicia montbretii Fisch. & Mey. (Synonym: Lens montbretii (Fisch. & Mey.) Davis & Plitmann)

Lens montbretii has a diploid chromosome number of In – 12 whereas the remainder of the genus has 2n= 14. In addition there are marked karyotype differences. These, combined with morphological characteristics which distinguish it from other species of Lens , are considered to be an adequate basis for the returning of the taxon to the genus Vicia as V. montbretii Fisch. & Mey.     

Protonemal gemmae on Amblystegium serpens (Hedw.) B., S. & G. from Macquarie Island

Abstract

Amblystegium serpens, collected on Macquarie Island, formed protonemal gemmae in laboratory culture. The gemmae germinated to form leafy shoots. They are presumed to be vegetative reproductive structures.     

Studies on Timmiella barbuloides (Brid.) Moenk., IV. SEM and TEM characterization of spore wall and first germination stages

Abstract

The spore wall morphology of Timmiella barbuloides (Pottiales, Musci) is described. The spores are catalept, with an ornamentation pattern consisting of unevenly spaced, shortly pedunculated pilum-and gemma-like processes. The spore coat consists of three, unevenly thick layers: intine, exine, and perine. The exine is not involved in wall ornamentation, the processes consisting of perine only. The leptoma, a spore coat area involved in germination, consists of an intine markedly thickening in an area of thinning exine and, outside, with a spore coat area where perinous processes become sparse. On the basis of observations and of the data reported in recent literature the classical definition of the leptoma is modified. It is considered to be a structurally specialized, but not necessarily thin, area.