多歧苏铁的修订

中国特有种。产云南东南部元江流域,个旧、蒙自、屏边与河口交界处,海拔200-1000     

德保苏铁——中国苏铁一新种

德保苏铁 新种 Cycas debaoensis Y.C.Zhong et C.J.Chen,sp.nov. Cycas multipinnatae C.J.Chen et S.Y.Yang affinis sed frondibus 7～11,1.5～3.5 mlongis,pinnulis fasciariis,apice longe acuminatis,ovulis persaepe 4,segmentis laminarummegasporophyllarum usque ad 50,filiformibus differt. 本种苏铁与多歧苏铁Cycas multipinnata C.J.Chen et S.Y.Yang相似,但叶7～     

海南岛苏铁一新种

葫芦苏铁（佛肚苏铁）新种图１ＣｙｃａｓｃｈａｎｇｊｉａｎｇｅｎｓｉｓＮ．Ｌｉｕ,ｓｐ．ｎｏｖ．ＴＹＰＥ：Ｈａｉｎａｎ（海南）,Ｃｈａｎｇｊｉａｎｇ（昌江）,ｈｉｌｇｒａｓｅｓ,ａｌｔ．８００～９００ｍ,１９９７０６１０,Ｎ．Ｌｉｕ（刘念）９７００...     

多歧苏铁——中国苏铁属一新种

多歧苏铁 独把铁,独脚铁(云南屏边) 新种     

泽泻科的花粉形态研究

本文对泽泻科11属27种代表植物的花粉进行了光学显微镜、扫描电镜和透射电镜观察。在系统描述了该科及各属植物花粉形态的基础上,将泽泻科植物的花粉划分为3种类型,即少果泽苔草型、慈菇型和泽泻型。根据花粉形态特征的比较,并依据泽泻科植物祖先类群的花粉具有船形、具单沟萌发孔、花粉外壁具明显的刺状纹饰、覆盖层完整无通道等特征,作者认为泽泻科植物花粉形态的如下演化趋势是明显的：由船形演化为卵球形、球形和多面体球形;由单沟萌发孔经过一无孔的中间类型演化为散孔类型;孔膜由光滑演化为具颗粒和小刺;萌发孔不内陷进化到内陷;花粉粒外壁的刺状纹饰逐渐过渡为颗粒状纹饰或者消失,以及覆盖层由无通道到具细通道和通道。     

中国秋海棠属新植物

1 黄连山秋海棠 新种 图1 Begonia coptidi-montana C. Y. Wu, sp. nov. (Sect. Alaecida C. B. Clarke) Species B. taiwanianae Hayata arctissime affinis, sed foliis minoribus remote levis-simeque denticulatis, capsularum alis variabilibus differt. Herba perennis. Rhizoma breve, crassum, atro-rubrum. Caulis 0. 7—1. 2 m altus, ro-bustus, atro-ruber, longitudinaliter angulatus, glaber. Folia alterna vel 2 ad ramum brevem     

贝母属三个分类群的核型研究

本文对浙贝Fritillaria thunbergii Miq．(取材于浙江鄞县和舟山)、东贝 F.thunbergii var． chekiangensis Hsiao et K.C.Hsia和皖贝F.anhuiensis S．C.Chen et S．F.Yin的核型进行了分析比较, 其中东贝和浙贝(舟山)为首次报道．浙贝的核型：取材于浙江鄞县的为2n=24=4m(1sc) ^l)+4st(1sc) +16t(1sc),取材于浙江舟山为 2n=24=2m+2sm+12st(1sc)+8t(2sc),东贝的核型为 2n＝24=2m+2sm+8st(2sc)+12t(4sc),皖贝的核型为2n=24=2m+2sm+8st(2sc)+12t(5sc)。3个分类群均属3B核型。     

柳叶藓科2种1变种在中国的新记录

笔者在编研(中国苔藓志》第七卷的过程中,发现柳叶藓科中的圆叶湿原藓Calliergon megalophyl- lum Mikut．、毛叶镰刀藓 Drepanocladus trichophyllus (Warnst．)Podp．和牛角藓宽肋变种Cratoneuron filicinum (Hedw．)Spruce var．atro-virens (Brid．)Ochyra为中国首次记录,而沼生湿柳藓 Hygroamblystegium noterophi-lum (Sull．et Lesq．)Warnst．属错误鉴定,所有以前被定为该种的中国标本应改为牛角藓宽肋变种。     

攀枝花苏铁传粉生物学研究

在攀枝花苏铁(Cycas panzhihuaensis L.Zhou et S.Y.Yang)自然群体中,雌雄株在数量上基本相等,但雄株的无性系产量是雌株的1.31倍,小孢子叶球的数量是大孢子叶球的2.21倍,呈现偏雄现象。小孢子叶球散粉次序是从轴基部向顶部和从小孢子叶的基部向顶部进行的,散粉高峰出现在午后,风传花粉浓度在2.55m内随着距离增加而迅速下降,而在2.55m以外维持在一个较低的水平上。在大孢子叶球内发现有两种蚂蚁和一种蜚蠊类昆虫在活动,没有发现这些昆虫对大孢子叶球的破坏,小孢子叶球则几乎没有昆虫探访。清晨在大孢子叶叶片上出现许多水样液滴,可能起着将大孢子叶叶片上沉积的花粉传递至胚珠的作用。研究表明,在攀枝花苏铁的传粉过程中,风是将花粉从小孢子叶球传至大孢子叶球的唯一媒介,大孢子叶球内活动的昆虫和大孢子叶叶片上的液滴同样起着传粉媒介作用,但不排除风传花粉一步到位的可能性。     

Notes on Cycas multipinnata C. J. Chen et S. Y. Yang

A more detailed descrption of a rare and endangered species Cycas multipinnata C．J．Chen et S．Y．Yang from SE Yunnan,China is given．Male and female cones of this species is described for the first time．Cycas longipetiolula D．Y．Wang is reduced and treated as a new synonym of the species．     

苏铁属一新亚种

苏铁属一新亚种陈介,云波（中国科学院昆明植物研究所,昆明６５０２０４）（个旧市第二中学,个旧６６１４００）关键词苏铁科,苏铁属,新亚种、蔓耗苏铁蔓耗苏铁新亚种ＡＮＥＷＴＡＸＡＯＦＣＹＣＡＳ（ＣＹＣＡＤＡＣＥＡｋ）ＩＮＹＵＮＮＡＮ￥ＣＮＥＮＣｈｅｉｈ（...     

石山苏铁与锈毛苏铁羽片解剖学研究

研究了石山苏铁与锈毛苏铁叶的羽片横切面结构,结果表明,石山苏铁叶表面具厚的角质层,表皮细胞壁厚,排成整齐的一列：下皮层厚壁细胞仅分布于中脉隆起区和叶缘：叶肉由栅栏组织和海绵组织构成,栅栏组织为排列整齐的柱状细胞组成,位于近轴面的表皮层下方,并延伸至中脉区：海绵组织的细胞分布于副转输组织两侧,含晶细胞少;韧皮部在远轴面,排成弧形;木质部在近轴面,管胞分散,锈毛苏铁的羽片横切面结构在叶缘的形态,叶脉区隆起形态,韧皮部形态,分泌道有无及下皮层厚壁细胞的特点等方面与石山苏铁存在较明显的差异,本文支持把两者作为独立种的观点。     

红河苏铁和元江苏铁的著者考证

The names Cycas hongheensis and C. parvula were not validly published in 1994 when they were first proposed, but were validated in 1996 by a different author.     

德保苏铁居群特征及保护措施

报道了德保苏铁(CycasdebaoensisY.C.ZhongetC.J.Chen)的居群结构调查情况,并与百色地区林业局1998年的调查结果进行比较。结果表明,德保苏铁分布区狭窄,仅产于广西壮族自治区德保县扶平乡约15.3hm2的石灰岩山坡;由于人为原因,其数量已从1998年的2000多株锐减到2001年的1085株,尤其是成年植株数量剧减,由此导致年龄结构趋于幼年化,呈现正金字塔的假象;雌雄比从1∶10变为1∶5,这些现状表明德保苏铁的保护刻不容缓。     

Isolation and characterization of microsatellite markers for Cycas debaoensis Y. C. Zhong et C. J. Chen (Cycadaceae)

Cycas debaoensis is one of the critically endangered cycad species endemic to China. In this study, we described the development of six microsatellite markers from the genome of C. debaoensis using the protocol of fast isolation by AFLP of sequences containing repeats (FIASCO) and two microsatellite markers derived from the database of expressed sequence tags (dbEST). Polymorphism of each locus was assessed in 60 adult individuals of the cycad. The average allele number of the microsatellites was 2.6 per locus, ranging from two to five. The observed and expected heterozygosities varied from 0.0833 to 0.7333 and from 0.0805 to 0.7188, respectively. Despite its rarity, only one locus (Y177) deviated from Hardy-Weinberg equilibrium due to the excessive homozygosity. The marker transferability of the eight primer pairs was tested on other four congeneric species that also occur in China.     

Karyotype Analysis of Cycas panzhihuaensis L. Zhou et S. Y. Yang

This paper reports chromosome number and karyotype analysis of Cycas panzhihuaensis endemic to China. The material was collected from Dukou, Sichuan. It is a diploid species, with 2n=22=2m+4sm+4st+l2t. The karyotype of Cycas panzhihuaensis is different from that of the other species of the genus Cycas, which was known to be 2n=4m+8st+10t. The former is a new karyotype in the genus. The authors briefly discuss karyotype evolution of the genus Cycas in this papar.