The Myxomycetes of the Miami Valley, Ohio. 



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ous ; the wall a thin, violaceous membrane, rugulose and 

 iridescent, studded with large and thick, snow-white, roundish 

 or elliptic scales of lime, at maturity splitting from the apex 

 downward into several segments. Stipe long, rather weak, 

 bent and flexuous, tapering upward, longitudinally rugulose, 

 from snow-white to whitish-ochre and smoky-white, usually 

 brownish at the base, and arising from a thin hypothallus. 

 Capillitium a delicate net-work of very slender threads, with 

 no expansions at the angles; the lime mostly concentrated in 

 one large, snow-white nodule at the center, a few very small, 

 roundish nodules scattered through the net-work. Spores 

 globose, very minutely warted, violaceous, 7-9 mic. in diam- 

 eter. 



Growing on old wood, mosses, etc.; a common species. 

 Sporangium .4-. 5 mm. in diameter, the stipe two or three 

 times this length. Tilmadoche compacta Wingate. It is 

 doubtful if Tilmadoche tolumbina Rost. belongs to this spe- 

 cies. According to Lister, Lepidoderma stellatum Massee, is 

 the same as this species, and if it be objected to the name 

 that there is already a Physarum compactum Khrenberg, it 

 may have to be called Physarum stellatum. 



b. Sporangium more or less irregtdar. 



6. Physarum lkucoph^um Fr. Sporangium globose or 

 depressed-globose, more or less irregular, the base never 

 umbilicate, stipitate or subsessile; the wall a thin violaceous 

 membrane, rugulose and iridescent, with a thin coat of small 

 white scales and granules of lime, or sometimes nearly naked. 

 Stipe variable in length, sometimes very short or quite obso- 

 lete, occasionally a few of them confluent, wrinkled, and sul- 

 cate, brown below, paler or whitish above. Capillitium a 

 dense irregular net-work of slender tubules, more or less 

 expanded at the angles ; the nodules of lime white, small, 

 roundish, or angular, few and scattered. Spores globose, very 

 minutely warted, violaceous, 8-10 mic. in diameter. 



Growing on old wood, bark, leaves, etc. The sporangium 

 .5-. 7 mm. in diameter, the stipe about the same length, or 

 shorter, and sometimes wanting. The lime on the wall and 

 in the capillitium is never abundant and sometimes extremely 



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