Abstract
Zygosporangium and zygospore formation in Zygorhynchus was followed by scanning and transmission electron microscopy. One or more slender, lateral zygophoric filaments proliferate from the subterminal portion of a septate, erect hypha. These lateral zygophoric branches recurve and conjugate with the stout, terminal zygophoric hypha. Heteromorphic gametangia are delimited asynchronously on either side of the fusion wall. Deposition of wart material on and within the inner primary wall layer is concomitant with fusion septum dissolution. The mature zygosporangial wall is composed of electron-opaque stellate, confluent warts with an elaborate ornamented inner surface. The potential taxonomic value of mature zygosporangium and zygospore topography in Zygorhynchus is examined.
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