The Myxomycetes oj the Miami Valley, Ohio. 



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brane, with a very thin layer of small white scales and 

 minute granules of lime, sometimes naked. Capillitium a 

 loose net-work of slender tubules, with slight expansions at 

 the angles; the nodules of lime white, numerous, more or less 

 elongated, irregularly lobed and branched. Spores globose, 

 even, violaceous, 7-9 mic. in diameter. 



Growing on old leaves, sticks, etc, Sporangia .3-4 mm. in 

 diameter, quite regular in shape, attached by a narrow base, 

 sometimes by a mere point, rarely confluent. The lime on 

 the wall of the sporangium is rather scanty, sometimes alto- 

 gether absent, and the nodules of lime in the capillitium are 

 rather small. The species is figured by Micheli N. P. G. 

 Tab. 96, Fig. 9. It is named by Fries S. M., Ill, p. 142. It is 

 figured again by De Bary, Die Mycetozoen, Tafel I. 



23. Physarum atrum Schw. Sporangia sessile, sub- 

 globose or oblong, by confluence, more or less elongated, bent 

 or flexuous and branched ; the wall a thin violaceous mem- 

 brane, rugulose, covered by a wrinkled and reticulate layer of 

 white granules of lime, which sometimes become thin or dis- 

 appear. Capillitium a loose net-work of tubules, more or less 

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

 large, irregularly lobed and branched. Spores globose, very 

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



Growing on old leaves, bark, grasses, etc.; apparently the 

 most common of these three cinereous species. Sporan- 

 gia .3-. 5 mm. in thickness, some of them roundish or oblong, 

 others elongated to several millimeters. The sporangium is 

 often elegantly reticulate as observed by Schweinitz even 

 when the lime is quite scanty. In Saccardo's Sylloge Berlese 

 changed the name to Physarum reticulatum, but this is unnec- 

 essary, as the Physarum atrum of Fries is not a Myxomyces. 



24. Physarum cinkrkum Batsch. Sporangia large, sub- 

 globose, sessile, gregarious, sometimes close and confluent; 

 the wall a thin violaceous membrane, with a closely adherent 

 layer of minute granules, over which are scattered irregu- 

 lar white scales of lime. Capillitium of tubules forming a 

 loose net-work, with wide expansions at the angles ; the 

 nodules of lime numerous, white, very large, with pointed 

 angles and lobes, by confluence often branched and reticulate, 



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