Four ergosterols, among which three are peroxides were isolated from the methanol ex-tract of the fungus Cryptoporus volvatus. Assignments of their 1H and 13C NMR resonance were achieved by the aid of 2D NMR experiments as well as comparison with reported data. And a possible biogenetic pathway for these compounds was proposed.

In this paper some of the decadal developments (1980-1992) on the Cucurbitaceous triterpenoids from different genera (Actinostemma, Bolbostemma, Cayaponia, Cucurbita, FevUlea, Gynostemma, Hemsleya, Luffa, Momordica, Neoalsomitra, Siraitia, Thiadiantha, Wilbradid) is presented. It is noticeable to discover oleane-type macrocyclic saponins, cucurbitane-type sweet glycosides, dammarane-type saponins, nor-curcurbitacin-type glucosides and baccharane-type, saponins. At the end of the paper, 83 references were listed.

The new Havonoid kwangsienin A(l), together with four known flavonoids, was iso-lated from the bark of Fissistigma kwangsiense and its chemical structure was eluciidated as 8-hydroxy-5, 6, 7-trimethoxy-flavanone.

Three monotetrahydrofuran type annonaceous acetogenins with keto groups. S7. S8.and S10, were isolated from the seeds of Annona muricata L.. Their structures have been elucidated on the basis of [a]D, 1H NMR. 13C NMR. MS and IR spectral evidences and they were named neo-isoannonacin-10-one(S10).neo-annonacin-10-one(S7)andiso-neoannonacin-10-one(S10).

Gastrodia elata Bl. is a plant belonging to orchid family which is parasitic on fungus Armillaria mellea. The fungal hyphae infect the ancestor or nutritive conns of the plant,but are arrested and digested in the cortical cells. The released nutrients are mainly transported into the terminal conns for its growth.

With the isolated and purified cpDNA, a library of cloned genomic fragments can be generated and the isolation and the nucleotide sequence of a given gene can further be conducted. However, the most generally applicable procedures for preparing purified cpDNA are very diffi-cult in Vitis species through the experience of our research work. In this paper we have developed a procedure which has been proved to be succesful in isolating and purifying the cpDNA of Vitis species, bearing comparing some species of other family.

This work is concerned karoyomorphological studies about somatic chromosomes of 6 species of genus Picea, in which there are 4 species dealt with for the frist time. The studies materi-al come from the alpine forset region of southwest Sichuan. The karyotypes formula and karyotypes are follows.

6 genera, about 37 species and varieties within Mimosaceae from China were mainly examined with electron microscope. A comparison was made among these genera, putting an em-phasis on the size and the aperture and the ornamentation of the exine, the results are as follows:Their pollen grains unite in 16-celled(except Aberama utile, which is 8-celled). In Acacia, the size of pollen is about 25-30 um, which is the smallest in all genera. And the others are over 50 urn. The apertures and the ornamentations of the exines in Albizia are smooth or subsmooth. It is quite different from Cylindrokelupha, Zygia and Calliandra, which are tuberculate. The genus Aberama is verrucate or subwart. Besides these, the taxomomic significance among them had been discussed.

The hepaticae family Acrobolbaceae and the species Acrobolbus ciliatus (Mitt.) Schiffn. collected from Yunnan is reported as new to mainland China, as well, their distribution is dis-cussed in detail.

Thirteen species belonging to Bryoria of Alectoriaceae are recognized in Yunnan. Among them, six species are new to China.they are Bryoria himalayana, B.levis, B.nepalensis B.nitidula, B.perspinosa, B.poeltii. And their distributions in Yunnan are also discussed. Besides, the morphological characteristics, the data of MCT and TLC from every specimen cited are also used in identifying species in this study. The specimens cited are deposited in the Cryptogamic Herbarium, Kunming Institute of Botany, Academia Sinica (HKAS) and the Mycological Herbanum, Institue of Microbiology, Academia Sinica (HMAS-L).

This paper deals with the classification of the fern genus Polystichum Roth Sect. Metapolystichum Tagawa of Sichuan Province. In the paper 9 species have been reported from Sichuan, of which 1 new species P. subulatum Ching is described, 5 species are first known to Sichuan, 7 names P. aculeatum (L.) Roth var. fargesii Christ, P. setiferum (Forssk.) Moore ex Woynar var. fargesii (Christ) C. Chr., P. yunnanense Christ var. fargesii (Christ) C. Chr., P. bicorlor Ching et S. K. Wu, P. makinoi (Tagawa) Tagawa var. chuanzangense Ching et S. K. Wu, P. lobatopinnulum Ching, Boufford et Shing, P. wuyishanense Ching et Shing are considered as new synonyms, a key to the species is also proposed, and some discussion is made concerning the species of China.

A species Protubera nipponica Kobay. of family Protophallaceae is reported and illus-trated from China for the first time. It has been found in Japan and Southern Yunnan of China, and it may be an endemic species of the Estern Asia according to the present data. This paper al-so discusses the taxonomic limits of genus Protubera M511er and places Protophallus Murrill, Protuberella Imai et Kawamura and Kobayasia Imai et Kawamura into the genus Protubera as its synonyms. Protubera may be inferred the genus of the tropical and subtropical distribution origi-nally from the modern geographic distributional patterns of the most species.

Arbor sempervirens，usque 15m alta.Ramuli robusti，cinereobrunnei  vel atro-brunnei,glabri vel puberuli；ramuli hornotini fulvo—grisei，sulcati，dense fulvo－pubescentes．Folia coriacea，oblongo—elliptica，5—16cm longa，3—6 cm lata，apice acuta vel acuminata，basi cuneata，margine integra，supra glabra，subtus dense albo vel fusco-lepidota et flavo stellato-pilosa,insimul intermito pilosa, costa media  robusta，nervis  latiralibus 6-15 nervi  supra  manifeste  impresi  canaliculati，subtus  prominentes，retibus venularum conspicuis，nervi laterales valde abeuntes prope marginem arcuati atque conjuncti.

2 genera (i.e. Didymoglossum Desv., Metathelypteris Ching) and 28 species of pteridophytes new recorded in Hainan Island, among them the genus Didymoglossum Desv. and 8 species also new to China, are reported in this paper.

The wood fossils were collected from Ping-zhuang Coal Mine, Chi-fong city, Inner Mongolia. There are two sets of sediments. The upper one was considered to be Miocene, Tertiary; the lower one was late Mesozoic. Among the upper one is the bed which contained the wood and other leaves fossils. Three species of wood fossils among them had been identified. They are Pseudotsugaxylon pingzhangensis sp. nov., Piceaxylon manchuricum Sze.

Flores hermaphroditi, erecti in thyrsum e cymis longiore pedunculatis, oppositis vel alternatis, 3- 7-floribus vel raro in corymbum confertim dispositi; calyces tubulares longiores, nervis 10 longitudinalibus; Androgynophora longitudine fructum fere aequantia vel superantia; petala pallidorubra, limbis bilobatis, raro multipartitis; coronae manifestae, raro nullae; styli 3. Semina reniformia, in dorso canaliculata. Herba perennis, radice lignoscenti. Caules laxe caespitosi. Folia basalia subanthesin marcida; caulina numerosa, ex axillis foliorum ramulos foliates steriles emittentia.

The dipterocarp forest of Xishuangbanna, with tropical Asian floristic element as its mainstay, undoubtedly belongs to tropical Asia flora in nature and acts as a part of northern margin of the latter. The forest, especially the part of tree layers, has the same family composition as dipterocarp forests of tropical Asia and most of its genera are shared by the latter and so the forest can be floristically classified as a type of the latter. As occuring at the northern margin of tropical zone of SE Asia, the flora of the forest is characterized by the merging of tropical Asian floristic element into subtropical floristic element of S China and is however transitional towards the forest flora of S China.

Taiwan is a part of the mainland of China. The Taiwan strait was formed as a result of faulting activity. The floras have closing relationship in both sides of the Taiwan strait with the mutual migration and distribution. Fujian-Taiwan land bridge is a part of the most shallow in the Taiwan strait. It was revealed on the sea surface for four times that is due to the regression in Pleistocene glacial epoch, therefore Fujian-Taiwan land bridge turned into passageway of the flo-ras migration on both sides of the Taiwan strait in Pleistocene Epoch.