POLLEN STUDIES IN THE GENUS CORDIA (BORAGINACEAE)

The pollen of 40 species of Cordia L. was studied by light microscopy and scanning and transmission electron microscopy. Three major types were found, 3-porate with a reticulate sexine, 3-colpate to 3-colporoidate with a striatoreticulate sexine, and 3-colpate to 3-colporate with a spinulose sexine. These pollen types are correlated with significant differences in the inflorescence, flower, and fruit structures found in the sporophyte. The following revisions are suggested and discussed: that Cordia sect. Varronia P. Br. be elevated to generic status; that Cordia sebestena L. and a few close allies be treated as generically distinct; and that Cordia myxa L. be conserved as the lectotype for the genus, thus continuing a wide application of the epithet Cordia.     

A STUDY OF THE PROPOSED GENUS OBREGONIA (CACTACEAE)

The monotypic genus Obregonia Frič was compared with Ariocarpus, Lophophora, Strombocactus, and certain other cactus genera. Obregonia and Ariocarpus are similar in characters of seeds, seedlings, habitat, fruits, and general habit. They differ in time of flowering, point of flower origin, areole structure, presence or absence of druses and a mucilage system, and presence or absence of spines. Obregonia and Lophophora are similar in characters of seeds, habitat, basic areole structure, and fruits. They differ in seedling form, habit of adult plants, presence or absence of spines, and chemical analysis. Strombocactus resembles Obregonia in few ways except in basic areole structure and some aspects of anatomy. The author concludes that Obregonia is an intermediate form between Ariocarpus and Lophophora and deserves generic rank. A formal taxonomic treatment of the genus follows the conclusions.     

栅锈菌属一新种

本文报告在包头市采于茜草科六月雪[Serissa serissoides(DC.)Druce]上的锈菌一新种——六月雪栅锈菌[Melampsora serissicola Shang,R.X.Li et D.S.Wang]。茜草科和六月雪属为栅锈菌属真菌的新报道寄主科、属。     

A PRELIMINARY RECOGNITION OF THE GENUS CHINOCYTHERE (OSTRACODA)

Chinocythere was established as a new genus in 1978 based on fossil ostracodes found from the Palaeogene Shahejie and Dongying Formations along the coastal region of the Bohai Sea. It was also found from the Palaeogene Weizhou and Liushagang Formations of the continental shelf in the northern part of the South China Sea as well as from the early Oligocene Nadou Formation in the Baise basin in Guangxi. In historical geology, Chinocythere first appeared and flourished in Eocene and then gradually declined and became extinct in Oligocene. Despite of its narrow horizontal distribution and limited vertical extension in the geologic section, there are a great many of varieties in this genus, with up to 87 species already published representing the coastal region of the Bohai Sea alone, this in a sense, affords us an invaluable condition for the study of its evolution.     

A SYSTEMATIC ANATOMICAL STUDY OF THE GENUS PERIDERIDIA (UMBELLIFERAE-APIOIDEAE)

Certain anatomical features, especially of roots, leaves, and fruits, provide useful criteria for delimiting a genus and defining its component species. Most species of Perideridia have 1-5 multistelic tuberous roots; however, P. Howellii and P. Kelloggii possess fascicles of up to 20 thickened fibrous roots, each of which is monostelic and composed of four or five primary xylem strands arranged alternately with isolated strands of secondary vascular tissues. The curious multistelic condition of the tuber apparently has not been reported for any other group of dicotyledons. An accessory vascular bundle located internally to the median collateral bundle of the leaf rachis is found in only three species of Perideridia. Depending on the species, the leaf mesophyll may be either dorsiventral or isolateral. In about two-thirds of the species, the oil ducts of the fruit are solitary in the intercostal intervals and paired on the commissure; in the remaining one-third they are more numerous in both situations, rising to 3-5 in the intervals and 12-13 on the commissure in P. Pringlei. Variation in number of oil ducts in the intervals assumes taxonomic importance because it has been used as a generic criterion in this group, but the present study shows no correlation between the number of oil ducts and other characters.     

THE GENUS PELECYPHORA (CACTACEAE): RESOLUTION OF A CONTROVERSY

The four species considered in this article fall into two natural groups. The evidence presented for this conclusion involves not only external features such as floral, fruit, and seed morphology, but also that obtained from internal structure, including tubercle and areole development, the anatomy of surface layers of mature tubercles, the structure of crystals in the ground tissues, and features of tracheary elements. When all evidence is considered, it becomes apparent that Pelecyphora aselliformis and Encephalocarpus strobiliformis are cogeneric as are P. valdeziana and P. pseudopectinata. Yet, the two cogeneric pairs are not closely related to each other. We do not propose to place them in any phylogenetic scheme as yet because general knowledge of the family Cactaceae is still too fragmentary. The first pair is assigned to Pelecyphora, of which a formal taxonomic treatment is presented, and the second pair is tentatively assigned to Thelocaclus.     

赤■属的胚胎学研究(英)

描述了葫芦科赤爬属植物生活史的主要过程以及胚胎学的重要特征,它们是：腺质绒毡层,胞质分裂同时型,小孢子四分体四面体型和等面体型,花粉粒散发时具两细胞,双珠被,厚珠心,寥型胚囊,珠孔端受精,胚胎发育柳叶菜型。     

THE ZYGOSPORIC STAGE OF THE GENUS PIRELLA (MUCORACEAE)

Hesseltine , C. W. (Northern Utilization Research and Development Division, Peoria, Ill.) The zygosporic stage of the genus Pirella (Mucoraceae). Amer. Jour. Bot. 47(3) : 225—230. Illus. 1960.–Pirella circinans Bainier has been found to be heterothallic. The zygospores, which have never before been reported, are formed when + and – strains are mated at 15°C. on such media as tomato paste-oatmeal or potato dextrose agars. Zygospores are formed in a diffuse manner in the aerial mycelium and are similar to those found in the genus Mucor. The single species, P. circinans, is described on a synthetic medium and its synonyms are listed. It is believed to represent a genus between Mucor and the family Thamnidiaceae.     

金盏苣苔属(苦苣苔科)的第二次校订

金盏苣苔属(Isometrum Craib)属于苦苣苔亚科(Cyrtandroideae)长蒴苣苔族(Didymocarpcae),是由W.G.Craib 1919根据I.farreri Craib建立的,同年他又把Didissandra glandulosa Batalin置于该属,1960年B.L.Burtt又把Didi-sandra Clarke中的4个种(即:D.prumuliflora Batalim,D.giraldii Diels,D.fargesii Franch.和D.leucantha Diels)移入该属。作者在编写中国植物志苦苣苔     

春华秋实，友谊花开——第12届国际孢粉学大会及中国代表活动侧记

四年一届的国际孢粉学界的学术盛会--国际孢粉学大会于2008年8月31日-9月5日在德国美丽的莱茵河畔城市波恩召开.本次会议为第12届会议,并与国际古植物大会同时同地联合召开,吸引了世界各地的800多位代表与会,实为空前盛况.参加本次会议的中国大陆地区代表共计46名,位列各国或地区之第6,真实反映了我国古植物与孢粉学界在近年来的发展状况.另外,中国台湾地区也有6位代表与会.     

血革螨属一新种(蜱螨亚纲:厉螨科)

本文记述采自云南剑川县大绒鼠巢中的血革螨属一新种,六毛血革螨Ｈａｅｍｏｇａｍａｓｕｓｓｅｘｓｅｔｏｓｕｓｓｐ．ｎｏｖ．,其背部刚毛呈三叉状,与多齿血革螨Ｈ．ｍｕｌｔｉｄｅｎｔｉｓ较相近,但肛板副毛６根,钳齿毛呈喇叭状,胸部副毛全部光滑,殖腹板较宽大,可与后者相区别。