In Merulius lacrymans Hartig has observed thin-walled hyphae with large lumina, the septa of which are perforated like those of sieve-tubes. [Please select]
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Sperm are present in small groups within the sustentacular cytoplasm, but ordinarily are absent in the lumina. [Please select]
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The lumina are filled with cellular detritus and are no longer bordered by a clear ring of sustentacular cytoplasm. [Please select]
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The seminiferous tubules of immature males are small, lack lumina, and contain a few large but inactive spermatogonia (Pl.) [Please select]
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Cæcus namque pedes claudo gressumque ministrat, At claudus cæco lumina, pro pedibus. [Please select]
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Nuclei of Sertoli cells, which outnumber the spermatogonia, are evident at the periphery of the tubules and the clear cytoplasm of the cells extends into and nearly fills the lumina. [Please select]
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By late August, clusters of sperm and metamorphosing spermatids surround the Sertoli cells; large numbers of sperm as well as sloughed cells representing various spermatogenic stages are present in the lumina. [Please select]
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