Five secoiridoid glycosides were isolated from Swertia punicea Hemsl. which identi-fied as a new glycoside amarogentin B ( n ), together with four known compounds amarogentin (I), gentiopicroside (in), sweroside (IV) and swertiamarin (V) by means of spectral and chemical analyses.

One new oleanane type triterpene compound ( 3β-hydroxy-olean-5, 12-dien-28-oic acid) , named hypoglauterpenic acid ( I ) , and six known oleanane type triterpene compounds, triptotriterpenic acid A (H), wilforlide B (ffl), wilforlide A (IV), oleanolic acid acetate (V), oleanolic acid (VI) and 3-epikatonic acid, were isolated from the ethyl acetate soluble fraction of the alcohol extract of the root of Tripterygium hypoglaucum (Levl. ) Levl. ex Hutch by the means of column chromatography.

Two new arborane type triterpenoids, rubiarbonol G (1) and rubiarbonone A (2), to-gether with rubiarbonol A, were isolated from the roots of Rubia yunnanensis Diels. Their structures were elucidated as 19a-acetoxy-3/?, 1p, 28-trihydroxy-arbor-9 (11) -ene and 19a-acetoxy-7^, 28-dihydroxyarbor-9 (11) -en-3-one by spectral and chemical methods, respectively.

From the roots of Picrorhiza scrophulariiflora Royle ex Benth. a new bitter cucurbitacin glycoside was isolated together with three known iridoidal glycosides, amphicoside (picroside-n ) (3), catalpol (4), aucubin (5), a phenol glycoside, androsin (6) and a known cucurbitacin glycoside (2).

Cinnamomum tenuipilum Kosterm. is a new perfume plant in Yunnan. Based on its major compounds of leaf oils from different strains, nine chemical types could be divided. Among them, the content of faresol type is 54-71 percent, of geraniol type is 86-98 percent, of linalool type is 84-98 percent, of methyl eugenol type is 69-89 percent.

In order to study the physiological effects of shade plant Vanilla fragrans (Salisb. ) Ames. on different light densities. Gas exchange and chlorophyll content of leaves and vegetalive and reproductional growth in Vanilla fragrans cultivated in different shade densities were measured and compared.

The test on differentiation of callus from the sterile seedling of Panax notoginseng (Burk) F. H. Chen was studied. The results demonstrated that the differentiation of P. notoginseng callus was obviously influenced by the different kinds of plant hormones. The MS medium containing 0.5-1.0 mg / L IBA or IAA could promote the differentiation of root, and the MS medium containing 0.5-1.0 mg / L BA could promote the differentiation of shoot. But their rates of differentiation were not very high.

Protoplasts isolated from monokaryon mycelia of wild Lentinus edodes in Yunnan and cultivar of Lentinus edodes were fused by applying electric field of sine wave 500kHz, 400pv / cm and square pulse 50us, 500Qpy / cm. Fused protoplasts were cultured into colonies for 10-15 days. The colonies from fusants were selected by discovering clamp connection of hyph^e under the light microscope.

In a diploid population of Lilium davidii D. in north-western Yunnan, triploid of the species with 36 (2n) chromosomes was found for the first time. It was essentially coincident with the diploid ( 2n=24) in morphological characters as well as in karyotypical and isoesterasal features, and might be sure to be an autotriploid of the species.

The present paper deals with the karyotype analyses of Pinus kwangtungensis Chun ex Tsian and Pinus densata Mast. endemic to China. Both of the karyotypic formulas of the two species found to be K (2n) =24= 24m, which are reported for the first time. The karyotypes of the genus Pinus ( 93 species and varieties ) are all composed of metacentric or/ and submetacentric chromosomes and belonging to 1A type. Based on the comparative analysis of . karyotypic data, the author has found that Subgen. Pinus is more advanced than Subgen. Strobus, and that the genus Pinus is the most primary one in Pinaceae and quite dis-tant from the other genera, although it somewhat related to Cathaya and Picea. It is, there-fore, approprite to regard Pinus as a monotypic Subfamily Pinoideae as suggested by Pilger.

Shorea chinensis forest distributing in Xishuangbanna, S Yunnan, is a forest type of the seasonal rain forest from northern edge of tropical zone of SE Asia. In comparison with various representative tropical rain forest communities, it is indicated that the forest has the same community profile as lowland tropical rain forests, the similar life form spectrum, leaf scale spectrum and leaf type and texture composition to equatorial rain forests, as well as al-most the same species diversity, frequency of the tree D. B. H. class and relationship between individuals / species as typical tropical rain forests.

While studying agarics from Yunnan，the authors have found a new fungus similar to Agrocybe cylindrica(DC:Fr)Maire．Based upon their observations in the field,comparative studies of its cultivation and cultural characters with those of A.cylindrica,a new species,Agrocybe alicacola Z．L．Yang，Zang et X．X．Liu，is proposed for it，which differs mainly in its pale—coloured pileus，decurrent lamellae，and lacking lamydospores in vitro. 

The original time and geological distribution of Quercus are disscussed based on fos-sil records. The fossil record of Quercus was thought to extend far back into the Cretaceous. Most Cretaceous fossils assigned to Quercus are however poorly preserved and none have been proven to be Quercus. The first believable record of Quercus is from the mid-dle Eocene Clarno Formation of Oregon, United States. This fossil showed that Quercus was already diverse in the Eocene.

Haec specles C．fallacii Schott videtur proxima，a qua differt folio heterochromo，supra viride inter costa atroviride vel atropurpureo，spathae tubo cylindrico 2.5—3 cm longo et 1-1.7 cm amplo，in medio leviter constricto；floribus masculis 10-12－andris；floribus masculis sterilibus absentibus；ovarii stigmate sessili，depresso—discoideo differt．

The taxonomic position of Sect. Chrysantha H. T. Chang was discussed here. C. chrysantha ( Hu) Tuyama and C. nitidissima Chi were further reduced to C. petelotii (Merr.) Sealy. Sect. Chrysantha H. T. Chang was the first time transfered to Sect. Archecamellia Sealy. . Some species of Sect. Chrysantha were revised and various incorrect determination was discussed with distribution record. 16 species and 3 varieties were determined in Sect. Archecamellia.