The Myxomycetes of the Miami Valley, Ohio. 31 



thickened hypothallus ; walls of the sporangia a thin pellucid 

 membrane, coated by a thin layer of white granules of lime. 

 Capillitium of very slender tubules, extending across from 

 wall to wall, sparingly branched and scarcely forming a net- 

 work, not at all or only slightly expanded at the angles; the 

 tubules for the most part empty, here and there with slight 

 fusiform or elongated swellings containing granules of lime, 

 occasionally bearing roundish or ellipsoidal nodules of larger 

 size. Spores globose, nearly smooth, violaceous, 6-9 mic. in 

 diameter. 



Growing on old trunks in woods in great abundance from 

 early Spring to Winter. Aethalium 3-6 or sometimes many 

 centimeters in extent and 1-2 cm. in thickness. The com- 

 mon cortex and the hypothallus are a millimeter or more in 

 thickness; they are composed of successive layers of thin 

 plates of membrane coated with granules of lime. 



b. Aethalium naked, i. e. f without a common cortex. 



2. FuLiGO vioiyACKA Pers. Plasmodium a soft effused 

 mass, dark red or wine-colored. Aethalium large, pulvinate 

 or effused, orbicular or more or less elongated and irregular, 

 the surface minutely pitted and perforate, furnished with a 

 scanty layer of lime, whitish or yellowish to brick-red in 

 color, leaving naked purple and violet spots and patches, 

 seated on a thin membranaceous brick-red hypothallus. 

 Sporangia long, narrow, and sinuous, closely packed together ; 

 the walls a thin violaceous membrane, rugulose and iridescent, 

 with scattered granules, or nearly destitute of lime. Capilli- 

 tium of slender violet tubules, forming a loose net-work, with 

 slight expansions at the angles ; the tubules with numerous 

 rather large vesicular expansions, ellipsoid or fusiform in 

 shape, and scantily furnished with lime. Spores globose, 

 nearly smooth, pale vinous, 6-8 mic. in diameter. 



Growing on old trunks in woods; not uncommon in this 

 region. Aethalium 1-3 or more centimeters in extent, and 

 5-10 mm. in thickness. The vesicles of the capillitium vary 

 from 15-30 or sometimes to 50 mic. in diameter, their inner 

 surface is usually coated by a single layer of granules of lime, 

 they are rarely filled with lime and sometimes are naked 

 entirely; when dry many of them are to be found collapsed. 



