Description of Napamichum
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With multilayered exospore, fusiform sporophorous vesicles with fibrous, crystalline and wide tubular inclusions and the lightly pyriform spores; monomorphic, diplokaryotic and monokaryotic; merogony - diplokaryotic merogonial plasmodium divides into numerous diplokaryotic merozoites; spores, 6.0 x 3.5 µm (N. dispersus), 5.4-5.8 µm (N. aequifilum) are slightly pyriform and uninucleate; exospore is characteristically multilayered with 5 layers of alternating density in N. aequifilum (4 in N. dispersus); polaroplast uniform, composed of saclike units (N. dispersus) or has two parts: anterior tight, irregular wide lamellae, and posterior more loosely arranged tubule-like sacs (N. aequifilum); polar tube is anisofilar with 4-5 wide anterior and 8-10 narrow posterior coils arranged in a single layer (N. dispersus) or is isofilar, arranged in 5-7 coils in a single rank (N. aequifilum type species N. dispersus (Larsson, 1984) Larsson, 1990 in fat body of midge larvae, Endochironomus sp. (Diptera, Chironomidae) (Larsson 1990).
