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SPORE WALL ULTRASTRUCTURE IN THE LIVERWORT ATHALAMIA HYALINA
Author(s) -
Steinkamp M. P.,
Doyle W. T.
Publication year - 1981
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1981.tb06377.x
Subject(s) - ultrastructure , lamella (surface anatomy) , biology , spore , dome (geology) , transmission electron microscopy , middle lamella , anatomy , morphology (biology) , botany , biophysics , optics , cell wall , paleontology , physics
Mature spores of Athalamia hyalina (Marchantiales, Cleveaceae) were examined with both scanning and transmission electron microscopes. Single, hollow, dome‐like projections, sometimes having small pores and a coarsely granular surface texture, stud the spore surface, usually in a pattern of concentric circles. In section, the spore wall has an intine and two‐layered exine. Intine‐like material separates some lamellae of the inner exine, which is joined to the outer exine around the dome bases. Inner exine lamellae are composed of thin (5–6 nm), closely parallel membrane‐like subunits. The outer exine is formed from a single large highly modified and doubly‐coated lamella, the undulations of which form the surface domes. Dome cavities often are filled with a loose network of granular material.