Tubifera casparyi

Tubifera casparyi (Rost.) Macbr. N. Am. Slime-Moulds 157. 1899
Siphoptychium Casparyi Rost. Monog. Append. 32. 1876.
Sporangia angular, cylindric, brown, to 3 mm. tall and 0.4 mm. wide, closely compacted into a pseudoaethalium varying in extent from 5 mm. to 10 cm. or more; peridium firm, persistent, iridescent, granular; hypothallus pallid, spongy, broad, rather thin; pseudocapillitium present in many sporangia as a coluraella-like central body, probably representing an abortive sporangium, sometimes a simple spine, more often connected with the wall by tubular processes or threads; spores umber-brown in mass, pale brown by transmitted light, reticulate over threefourths of the surface, 7.5-9 p in diameter; Plasmodium white, changing to dull gray, then umber.
Type locality: Europe. Habitat: Dead wood.
Distribution: Throughout North America; Europe; Japan.