广西十万大山蕨类植物区系特征及垂直分布的数量研究

十万大山植物区系位于北回归线以南,蕨类植物非常丰富,现已发现５２仲、１１３属、２６４种。区系地理成分复杂多样,属可以划分１１种类型（变型）,可种可以划分为１４种类型（变型）。本区系具有明显的热带亲缘,热带分布属占８１．４２％,热带分布种占６６．７７％。亚洲热带分布及其变型占有较大的比例,表明本区系与亚洲热带植物区系特别是中南半岛区系有密切的亲缘关系。区系地理成分有明显的垂直分布规律,聚类分析的结果     

Distribution of diacylglyceryltrimethylhomoserine in selected species of vascular plants

Diacylglyceryltrimethylhomoserine was detected in 15 out of 16 species of pteridophytes but in none of four gymnosperm and seven angiosperm species examined. Psilotum nudum was the only pteridophyte species examined that did not contain the lipid.     

Airborne pollen of entomophilous plants and spores of pteridophytes in Rzeszów and its environs (SE Poland)

Airborne pollen of entomophilous plants occurred in low or very low concentrations, and constituted 4 of the total pollen sum. In 1997–2002, between 18 and 26 taxa were identified. Out of this large group the following taxa were represented in larger concentrations every year– Salix, Acer, Morus, Cichorioideae, Asterioideae, Plantago major/media, Sambucus nigra and Tilia. Microscopic examination revealed that pollen grains of the above mentioned species were often glued together, which is a typical adaptation to this kind of pollination. Club moss (Lycopodium spp.) and horsetail (Equisetum spp.) spores were recorded sporadically. Fern spores were found frequently but in very low numbers. In 2002 the occurrence of the airborne pollen of entomophilous plants in the city and in the countryside was compared. A higher percentage value of pollen was found in the atmosphere of the city rather than in the countryside, due to the high concentration of Acer pollen, which is a partly entomophilous species and common in municipal plantings. In the countryside air there was a higher concentration of pollen from purely entomophilous species, such as Viburnum and Asteroideae.     

福建福州鼓山药用蕨类植物资源调查

经调查,福州鼓山药用蕨类植物共有42种,分属21科,31属。本文对其药用价值及其生境特征进行描述。     

An architectural analysis of Archaeopteris9 a fossil tree with pseudomonopodial and opportunistic adventitious growth

Currently recognized hierarchies of lateral organs in Archaeopteris are presented and phenomena that mediate organography and organotaxis in the taxon are discussed. It is demonstrated that Archaeopteris is totally lacking extant architectural analogues, and the methodology employed in the architectural analysis of such fossil plants is introduced. Proposed growth categories or phases for the Archaeopteris plant are presented and tested against evidence from a large silicified log of Callixylon, the trunk of Archaeopteris. An architectural model is put forward that encompasses such growth phaseS. Finally, the occurrence of reiterative, opportunistic growth in Archaeopteris is discussed.