广西苦苣苔科植物花粉形态

对广西苦苣苔科(Gesneriaceae)8个属(1个特有属)11个种(8个特有种)的花粉形态进行了扫描电镜的观察。结果发现这些不同属种的花粉形状均为长球形或近球形,花粉形状对苦苣苔科的系统与分类没有多大的参考价值。但花粉外壁纹饰则有多种类型。其中,吊石苣苔属(Lysionotus)、金盏苣苔属(I sometrum)、长檐苣苔属(Dolicholoma)、紫花苣苔属(Loxostigma)、半蒴苣苔属(Hemiboea)、圆唇苣苔属(Gy rocheilos)及唇柱苣苔属(Chirita)中的百寿唇柱苣苔(C.baishouensis)为网状纹饰;唇柱苣苔属(Chirita)的桂林唇柱苣苔(C.gueilinensis)和融安唇柱苣苔(C.ronganensis)为拟网状纹饰;异唇苣苔属(Allocheilos)为脑纹状纹饰。孢粉学特征表明,花粉外壁纹饰特征在苦苣苔科的分类与系统研究方面可能具有较大价值。     

广东苦苣苔科植物新资料

报道了六个广东分布新记录：大齿马铃苣苔、匐茎短筒苣苔、短茎半蒴苣苔、圆唇苣苔和毡毛后蕊苣苔;描述了一个新变种：绵毛马铃苣苔。     

Effects of regional climate and small‐scale habitat quality on performance in the relict species Ramonda myconi

Abstract. The Mediterranean Basin harbours paleo‐endemic species with a highly restricted and fragmented distribution. Many of them might also be of the remnant type, for which the regional dynamics depends on the persistence of extant populations. Therefore, a key issue for the long‐term persistence of these species is to assess the variability and effects of ecological factors determining plant performance. We investigated the spatio‐temporal variability in plant traits and ecological factors of Ramonda myconi, a preglacial relict species with remnant dynamics, in 5 populations over 4–7 yr. Ecological factors contributing to fecundity showed a high degree of between‐year variability. Pre‐dispersal fruit predation had a minor influence on total reproductive output, and most of the variability was found among individuals within populations and years. Spatio‐temporal variability in growth and survival was rather low but significant, whereas recruitment showed important between‐population variability. Among‐year variability in fecundity and growth was related to climatic fluctuations on a regional scale, notably rainfall and temperature in a particular period, while the spatial variability in survival and recruitment was explained by within‐population (patch) habitat quality. Although R. myconi is able to withstand repeated periods of drought, water availability seems to be the most important factor affecting plant performance in all the study populations. These findings suggest that the long‐term persistence of species showing remnant population dynamics in habitats under the influence of Mediterranean climate might be threatened by increased aridity as a result of climate change.     

Wentsaiboea D. Fang & D. H. Qin,a new genus of the Gesneriaceae from Guangxi,China

Wentsaiboea renifolia D. Fang & D. H. Qin, a new genus and species of Gesneriaceae from Guangxi, China, is described and illustrated. This genus is similar to Dolicholoma D. Fang & W. T. Wang in the shape of stigma, but differs by having leaves reniform, palmately nerved and base cordate, corolla obliquely campanulate, corolla lobes rounded, and both stamens and staminodes adnate to corolla tube near base. It is also similar to Chiritopsis W. T. Wang in the habit, but differs by having leaves palmately nerved, corolla tube campanulate and abaxially swollen, and stigma hippocrepiform.     

Paralagarosolen Y. G. Wei,a new genus of the Gesneriaceae from Guangxi,China

Paralagarosolen fangianum Y. G. Wei, a new genus and species of Gesneriaceae from Guangxi, China, is described and illustrated. Paralagarosolen Y. G. Wei is closely related to Lagarosolen W.　T. Wang in having corolla tube cylindric, not swollen, and stigmas 2, but differs by having leaves sometimes peltate at base, cyme with only one flower, corolla lobes rounded-obtuse at apex, and capsule broadly ovoid-ellipsoid.     

Paraboea guilinensis L. Xu & Y. G. Wei,a new species of Gesneriaceae from Guangxi,China

A new species of Gesneriaceae, Paraboea guilinensis L. Xu & Y. G. Wei, is described from Guangxi, China. The new species is similar to P. crassifolia (Hemsl.) Burtt in its habit and leaf form, but differs by its leathery leaves, glabrous peduncles, pedicels and calyx, distinctly bilabiate corollas, and capsules not spirally twisted.     

Pseudochirita guangxiensis var. glauca Y. G. Wei & Yan Liu,a new variety of the Gesneriaceae

Pseudochirita guangxiensis (S. Z. Huang) W. T. Wang var. glauca Y. G. Wei & Yan Liu, a new variety of the Gesneriaceae from Guangxi, China, is described. It differs from the typical one, var. guangxiensis by having leaves subentire or with only inconspicuous obtuse serrations, stem and leaves densely adpressed tomentose, and corolla sparsely glandular puberulous outside.     

直瓣苣苔属、筒花苣苔属和吊石苣苔属4个种的核形态学研究

本文报道了苦苣苔科直瓣苣苔属Ancylostemon、筒花苣苔属Briggsiopsis和吊石苣苔属Lysionotus 中4个种的染色体数目和核形态。凹瓣苣苔A．aureus的染色体数目为n=34,与其近缘种凸瓣苣苔 A．convexus的染色体数目相同。该种的核型公式为2n=20m(1sat)+14sm,核型类型属于2A。间期核 为复杂染色中心型(complex chromocenter type);细胞有丝分裂前期的染色体为近基型(proximal type) 我国特有单种属筒花苣苔属Briggsiopsis的间期核为简单—复杂染色中心型(simple-complex chromocenter type);细胞有丝分裂前期的染色体为中间—渐变型(interstitial—gradient type);核型公式为2n=34=25m +6sm+3st,与近缘类群——粗筒苣苔属Briggsia染色体数目2n=34,68相比,无论染色体数目还是核 型均显示比较原始的特征。吊石苣苔属的蒙自吊石苣苔L．carnosus和翅茎吊石苣苔L．serratus D． Don var．pterocaulis的核型公式分别是2n=30=21m+5sm+3st+1t和2n=32=21m+10sm+1t。核 型类型分别属于2A和2B。间期核均为简单—复杂染色中心型(simple-complex chromocenter type);细胞 有丝分裂前期的染色体为渐变型(gradient type)。