用掃描電子顯微鏡研究蕨類植物之孢子——八、臺灣之桫欏科及其相關種

Scanning Electron Microscopical Studies on the Spores of Pteridophytes. VIII. The Tree Fern Family (Cyatheaceae) and Its Allied Species Found m Taiwan

The spores of seven species of Cyatheaceae found in Taiwan are studied and analyzed. Incipient heterospory is found in two species of Alsophila having spinulose spores (A. mettemiana and A. podophylla). Spinulose type of spores are also found in Sphaerapteris lepifera. Most other Alsophilas have striated spores (A. denticulata, A. fenicis, A. loheri, and A. spinulosa). The general evolutionary sequence of sculptine morphology in the Cyatheaceae are discussed in terms of traditional systems of classification and the phylogeny proposed recently by Tryon. The psilate and striated spores of Cibotium cumingii and C. barometz (Dicksoniaceae), respectively, are also studied and their possible phylogenetic relationship to the Cyatheaceae evaluated.