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SYSTEMATICS OF THE ZYGNEMATACEAE (CHLOROPHYCEAE). II. ZYGOSPORE‐WALL STRUCTURE IN SIROGONIUM AND A TAXONOMIC PROPOSAL 1
Author(s) -
Hoshaw Robert W.
Publication year - 1980
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1980.tb03026.x
Subject(s) - biology , spore , botany , systematics , taxonomy (biology)
Zygospore‐wall structure is described for nine species of Sirogonium using the light microscope and scanning electron microscopy (SEM) on spores from cultures and on glycerin‐preserved spores from field collections. Zygospores possess four distinctive wall layers with the innermost and outermost smooth and composed of cellulose. The two median wall layers are pigmented and the innermost of these may be conspicuously ornamented as in Sirogonium ceylanicum Wittrock, S. hui (Li) Transeau, S. melanosporum (Randhawa) Transeau, S. ventersicum Transeau, S. pseudofloridanum (Prescott) Transeau and S. illinoisense (Transeau) G. M. Smith. Inner median wall layers of S. floridanum (Transeau) G. M. Smith, S. sticticum (J. E. Smith) Kützing and S. tenuis (Nordstedt) Transeau lack distinctive ornamentation, but possess minor depressions or small raised areas on their surfaces. Types of ornamentation revealed by SEM are compared with earlier light microscope observations and the interpretations from SEM are used to construct improved taxonomic keys to Sirogonium .