The Myxomycetes of the Miami Valley, Ohio. 



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I. ANGIORIDIUM Grev. Plasmodiocarp laterally com- 

 pressed, more or less elongated and flexuous, attached by the 

 lower margin to the substratum, and, at maturity, regularly 

 dehiscent along the upper margin by a longitudinal fissure ; 

 the wall a firm membrane, with the granules of lime forming 

 a reticulate layer on the inner surface. k Capillitium a loose, 

 irregular net-work of tubules, extending from side to side, 

 and containing large, irregular nodules of lime. Spores 

 globose, violaceous. 



A genus readily distinguished by its laterally compressed 

 plasmodiocarp, splitting lengthwise by a regular fissure. The 

 wall is a single membrane, and there is but a single reticulate 

 layer of lime upon it, which is plainly on the inner surface. 



i. Angioridium sinuosum Bull. Plasmodiocarp laterally 

 compressed and very much flattened, more or less elongated 

 and flexuous, sometimes confluent and branched or reticulate, 

 without any hypothallus ; the wall a more or less thickened 

 and brownish membrane, the inner surface coated with a 

 dense reticulately thickened white layer of lime, and often 

 studded with the white nodules. Capillitium of hyaline 

 tubules, forming a loose irregular net-work, with numerous 

 broad vesicular expansions filled with lime; the nodules 

 white, very large, irregularly lobed, and branched. Spores 

 globose, very minutely warted, violaceous, 8-10 mic. in 

 diameter. 



Growing on old leaves, sticks, mosses, etc. Plasmodiocarp 

 commonly about 1 mm. in height and 1-5 mm. in length, but 

 the size is variable. The color appears to depend upon the 

 thickening of the membrane ; when it is thin and pellucid, 

 the color is white or cinereous from the inner layef of lime 

 and the contained spores ; with a more thickened membrane, 

 the color becomes ochraceous or brownish. Physarum 

 bivalve Pers. Physarum sinuosum of Rostafinski's mono- 

 graph. 



II. Ciknkowskia Rost. Plasmodiocarp terete, elongated, 

 flexuous, creeping, and reticulate, irregularly dehiscent ; the 

 wall a more or less thickened membrane, externally naked, 

 with the granules of lime on the inner surface. Capillitium 



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