The Myxomycetes of the Miami Valley, Ohio. 



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upward, expanding at the base into a small hypothallus. 

 Capillitium of slender tubules forming a loose net-work, 

 more or less expanded at the angles and for the most part 

 filled with lime ; the nodules white, slender, much elongated 

 and branched, with pointed lobes and branchlets. Spores 

 globose, very minutely warted, dark violaceous, 11-13 mic. in 

 diameter. 



Growing on old stalks of Zea mays. Sporangium .5~.6 

 mm. in diameter, the stipe about twice this length. The lower 

 part of the capillitium is sometimes entirely filled with lime, 

 so that the species approaches Badhamia in the structure of 

 its capillitium. 



18. Physarum lkucopus Link. Sporangium globose, the 

 base slightly flattened, stipitate ; the wall a thin, violaceous 

 membrane, with a white, pulverulent outer coat of minute 

 granules of lime. Stipe short, thick, erect, snow-white, longi- 

 tudinally rugulose, tapering upward, expanding at the base 

 into small, white hypothallus. Capillitium a loose net-work 

 of tubules, with wide expansions at the angles ; the nodules 

 of lime large, white, numerous, irregularly lobed and 

 branched. Spores globose, very minutely warted, violaceous, 

 8-10 mic. in diameter. 



Growing on old wood, leaves, etc. Sporangium .3-4 mm. 

 in diameter, the stipe about the same length as the diameter. 

 Our specimens are a smaller form than the European, with 

 smaller and smoother spores. Superficially the species re- 

 sembles Didymium squamulosum, and it is Didymium leucopus 

 of Fries, S. M. 



19. Physarum glaucum Phillips. Sporangium globose, or 

 the base slightly depressed, stipitate; the wall a thin, viola- 

 ceous membrane, covered with minute, white granules and 

 small roundish or irregular scales of lime. Stipe short, stout, 

 erect, black, longitudinally wrinkled, expanding at the base 

 into a small hypothallus. Capillitium of much-flattened 

 tubules, forming a loose net-work, widely expanded at the 

 angles ; the nodules of lime numerous, large, white, irreg- 

 ular, with pointed angles and lobes. Spores globose, very 

 minutely warted, dark violaceous, 12-14 m i c - in diameter. 



Growing on old leaves : California. Sporangium .5-. 7 mm. 



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