학술논문
Oncophoraceae (Bryophyta): a palynological treatment of species occurring in the Americas.
Document Type
Academic Journal
Author
Passarella MA; Programa de Pós-Graduação em Ecologia, Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas, Campus Universitário, Rua José Lourenço Kelmer, s/n, 36036-900 Juiz de Fora, MG, Brazil.; Luizi-Ponzo AP; Programa de Pós-Graduação em Biodiversidade e Conservação da Natureza, Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas, Departamento de Botânica, Campus Universitário, Rua José Lourenço Kelmer, s/n, 36036-900 Juiz de Fora, MG, Brazil.
Source
Publisher: Academia Brasileira De Ciencias Country of Publication: Brazil NLM ID: 7503280 Publication Model: eCollection Cited Medium: Internet ISSN: 1678-2690 (Electronic) Linking ISSN: 00013765 NLM ISO Abbreviation: An Acad Bras Cienc Subsets: MEDLINE
Subject
Language
English
Abstract
Oncophoraceae are acrocarpous mosses that predominantly grow as tufts or cushions and especially occur on rocks and soil. The recognition of Oncophoraceae as a distinct family, as well as its generic circumscription, is not consensus among authors, and the pursuit for new information to improve its characterization is incessant. The present work aims to characterize the spore morphology and ultrastructure of 19 species (eight genera) occurring in the Americas and to evaluate the relevance of palynological data to circumscribe species, contributing to support other palynological studies. Observations were performed under Light and Electron (Scanning and Transmission) Microscopes. A Cluster Analysis was performed in order to evaluate the meaning of the palynological data, especially concerning the establishment of the species circumscription. Spores are monads, small to medium sized (10.40 to 44.20 μm), radially symmetric, subcircular in amb, heteropolar or apolar; the surface is ornamented by granules, gemmae and bacula. Anisomorphic spores were observed in eight studied species and are reported herein for the first time. The Cluster Analysis shows two groups with low similarity, which primarily differ by the polarity of the spores. The circumscription of Kiaeria and Cynodontium is corroborated by palynological characterization and endorsed by Cluster Analysis.