马来西亚番荔枝科紫玉盘属(Uvaria Linn.)、杯冠木属(Cyathostemma Griff)和Ellipeia Hook.f. Thomson 叶的比较解剖学

对紫玉盘属8种,杯冠木属3种和Ellipeia属1种进行了叶的比较研究,以调查不同种之间解剖学的不同点,这对种的鉴别和了解它们的分类学意义可能是有用的.有意义的解剖学特征是:末端石细胞,表皮细胞的晶簇,毛状体,在中脉和叶柄的薄壁组织内的短石细胞以及中脉和叶柄横切面的形状.有某些特征仅出现在某些种中,这对种的鉴别是有用的.结果亦显示这三个属的联系十分紧密.     

马来西来番荔枝科紫玉盘属(Uvaria Linn.)、杯冠木属(Cyathostemma Griff.)和Ellipeia Hook.f.et Thomson叶的比较解剖学

对紫玉盘属8种,杯冠木属3种和Ellipeia属1种进行了叶的比较研究,以调查不同种之间解剖学的不同点,这对种的鉴别和了解它们的分类学意义可能是有用的.有意义的解剖学特征是末端石细胞,表皮细胞的晶簇,毛状体,在中脉和叶柄的薄壁组织内的短石细胞以及中脉和叶柄横切面的形状.有某些特征仅出现在某些种中,这对种的鉴别是有用的.结果亦显示这三个属的联系十分紧密.     

马来西亚番荔枝科紫玉盘属（Uvaria Linn. …

对紫玉盘属８种,杯冠木属３种和Ｅｌｌｉｐｅｉａ属１种进行了叶的比较研究,以调查不同种之间解剖学的不同点,这对种的鉴别和了解它们的分类学意义可能是有用的。有意义的解剖学特征是：末端石细胞,表皮细胞的晶族,毛状体,在中脉和叶柄的薄壁组织内的短石细胞以及中脉和叶柄横切面的形状。有某些特征仅出现在某些种中,这对种的鉴别是有用的。结果亦显示这三个属的联系十分紧密。     

报春花属藏报春组、毛茛叶报春组的界定和系统发育关系 :核糖体DNAITS序列证据(英文)

报春花属 (PrimulaL .)藏报春组 (sect.AuganthusPaxexBalf.f.)和毛茛叶报春组 (sect.RanunculoidesChenetC .M .Hu)的界定一直是没有解决的问题。应用核糖体DNAITS序列数据探讨其系统发育关系。取样包括藏报春组和毛茛叶报春组的全部 5个种以及其他一些相关组的代表种。ITS系统树表明 ,陕西羽叶报春 (P .filchneraeKnuth)应与藏报春 (P .sinensisSabineexLindl.)和野藏报春 (P .rupestrisBalf.f.etFarrer)一起置于藏报春组 ;毛茛叶报春组只含两种 :毛茛叶报春 (P .cicutariifoliaPax)和安徽羽叶报春 (P .merrillianaSchltr.)。这两组并不具密切亲缘关系 ,它们在报春花属中与其他组的关系还需进一步研究。研究也表明ITS序列可以为报春花属的系统发育重建提供大量可靠资料     

MORPHOLOGY AND MOLECULAR PHYLOGENY OF AUREOPHYCUS ALEUTICUS GEN. ET SP. NOV. (LAMINARIALES,PHAEOPHYCEAE) FROM THE ALEUTIAN ISLANDS1

A previously unknown species of kelp was collected on Kagamil Island, Aleutian Islands. The species can be easily distinguished from any known laminarialean alga: the erect sporophytic thallus is composed of a thin lanceolate blade attaining ～2 m in height and ～0.50 m in width, without midrib, and the edge of the blade at the transition zone is thickened to form a V‐shape; the stipe is solid and flattened, slightly translucent, attaining ～1 m in length; the holdfast is semidiscoidal and up to 0.15 m in diameter. Anatomically, the blade has the typical trumpet‐shaped hyphae characteristic of the Chordaceae and derived foliose laminarialean species (i.e., Alariaceae/Laminariaceae/Lessoniaceae). No hair pits or mucilaginous structures were observed on the blade or stipe. No fertile sporophytes were collected, but abundant juvenile sporophytes were observed in the field. In the molecular phylogenetic analyses using chloroplast rbcL gene, nuclear ITS1‐5.8S‐ITS2 rDNA, and mitochondria nad6 DNA sequences, the new species (Aureophycus aleuticus gen. et sp. nov.) showed a closer relationship with Alariaceae of conventional taxonomy, or the “Group 1” clade of Lane et al. (2006) including Alaria and related taxa than with other groups, although the species was not clearly included in the group. Aureophycus may be a key species in elucidating the evolution of the Alariaceae within the Laminariales. Because of the lack of information on reproductive organs and insufficient resolution of the molecular analyses, we refrain from assigning the new species to a family, but we place the new species in a new genus in the Laminariales.     

ATRACTOMORPHA ECHINATA GEN. ET SP. NOV., A NEW ANISOGAMOUS MEMBER OF THE SPHAEROPLEACEAE (CHLOROPHYCEAE)1,2

Atractomorpha echinata gen. et sp. nov. is described from isolates derived from zygotes present in a dry soil sample obtained from Texas. The new genus is distinguished from Sphaeroplea primarily by its pattern of vegetative growth. While Sphaeroplea is distinctly filamentous with numerous coenocytic cells uniseriately arranged, Atractomorpha grows as individual, multinucleate, spindle-shaped cells with sharply pointed extremities. Such cells may vary considerably in length (25–6000 μm, or more) and normally lack septa. In young, rapidly growing cultures the cells often attain lengths of 300–500 μm, but rarely exceed 1800 μm. The new species is further characterized by: (1) the regular formation of biflagellate zoospores in asexual reproduction, (2)anisogamy (occasionally oogamy) and (3) the size and ornamentation of its zygotes. Variations in vegetative morphology are discussed as are conditions for obtaining gametogenesis.     

COMPARATIVE DEVELOPMENT OF THE RED ALGAL PARASITES BOSTRYCHIOCOLAX AUSTRALIS GEN. ET SP. NOV. AND DAWSONIOCOLAX BOSTRYCHIAE (CHOREOCOLACACEAE,RHODOPHYTA)1

The development of two red algal parasites was examined in laboratory culture. The red algal parasite Bostrychiocolax australis gen. et sp. nov., from Australia, originally misidentified as Dawsoniocolax bostrychiae (Joly et Yamaguishi-Tomita) Joly et Yamaguishi-Tomita, completes its life history in 6 weeks on its host Bostrychia radicans (Montagne) Montagne. Initially the spores divide to form a small lenticular cell, and then a germ tube grows from the opposite pole. Upon contact with the host cuticle, the germ tube penetrates the host cell wall. The tip of the germ tube expands, and the spore cytoplasm moves into this expanded tip. The expanded germ tube tip becomes the first endophytic cell from which a parasite cell is cut off that fuses with a host tier cell. The nuclei of this infected host cell enlarge. As parasite development continues, other host-parasite cell fusions are formed, transferring more parasite nuclei into host cells. The erumpent colorless multicellular parasite develops externally on the host, and reproductive structures are visible within 2 weeks. Tetrasporangia are superficial and cruciately or tetra-hedrally divided. Spermatia are formed in clusters. The carpogonial branches are four-celled, and the carpogonium fuses directly with the auxiliary (support) cell. The mature carposporophyte has a large central fusion cell and sympodially branched gonimoblast filaments. Early stages of development differ markedly in Dawsoniocolax bostrychiae from Brazil. Upon contact with the host, the spore undergoes a nearly equal division, and a germ tube elongates from the more basal of the two spore cells, penetrates the host cell wall, and fuses with a host tier cell. Subsequent development involves enlargement of the original spore body and division to form a multicellular cushion, from which descending rhizoidal filaments form that fuse with underlying host cells. This radically different development is in marked contrast to the final reproductive morphology, which is similar to B. australis and has lead to taxonomic confusion between these two entities. The different spore germination patterns and early germ-ling development of B. australis and D. bostrychiae warrant the formation of a new genus for the Australian parasite.     

中国中三叠世龙蝎蛉新科的发现(昆虫纲,长翅目)

记述龙蝎蛉新科Drakonochoristidae fam. nov.和1新亚科及其2新属、种和1个老亚科。2新属种的化石标本采自中国陕西铜川中三叠统铜川组下段上部的灰绿色泥岩和页岩。新科性质及其分类位置在文中进行讨论。新科的建立填补这个类群在中国的空白,同时对于小蝎蛉科Nannochoristidae和二叠蝎蛉科Permochoristidae的演化关系的研究有一定的意义。这些新属、种系陕西昆虫群(陕西生物群的一个类别)铜川昆虫组合的新成员。铜川组的时代相当于欧洲拉丁尼期(Ladinian Stage)。     

兴安松引种栽培的研究

兴安松为偃松一变型,近年来才发现,数量甚少,为加强对这一种质资源的保护和利用,我们对其生物,生态学特性及繁殖技术进行了研究。结果表明：嫁接是繁殖兴安松有效的方法;红松和樟子松是最理想的砧木。由于嫁接成功,使兴安松在黑龙江省森林植物园得到了迁地保护。