University of Isfahan Taxonomy and Biosystematics 3115-9001 6 21 2014 12 22 The morphological and anatomical reinvestigation of the Psilotum nudum, in Hyrcanian forests, N Iran بررسی مجدد ریخت‌شناسی و تشریحی Psilotum nudum در جنگل‌های پست خزری، شمال ایران 87 96 17543 EN Fatemeh Bazdid Vahdati Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran Shahryar Saeidi Mehrvarz Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran Alireza Naqinezhad Department of Biology, Faculty of Basic Sciences, University of Mazandaran, Babolsar, Iran Robabeh Shahi Shavvon Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran Journal Article 2016 06 14 Psilotum nudum is an ancestral epiphytic of the monilophytes which has been recently reported from Hyrcanian forests. It was already introduced as an epiphytic species from some patchy habitats in the lowland parts of Hyrcanian forests. Moreover, Psilotum nudum was reviewed using morphological and anatomical characteristics in two different populations in central parts of Hyrcanian zone. The results showed that there were no significant differences between morphological and anatomical characteristics. The aerial stems of the plant were linear, chlorophyllous, and dichotomously branched. Leaves were much reduced, simple, scale-like, and without ligules. Synangium was composed of 3-locular capsule-like sporangia. Also, stele type in apex aerial stem and aerial stem was actinostele and it was haplostele type in rhizome. In this paper, a new locality of this species growing on the rocky sites was reported in Ata-kuh of Guilan. https://tbj.ui.ac.ir/article_17543_8aeafddbbc0bd11fa1b4355c4e26ef09.pdf