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Cincinnati Society of Natnral History. 



3. Fuligo FLAVA Pers. Plasmodium effused lemon-yellow. 

 Aethalium mostly effused, irregular, the' surface reticulate, 

 pitted and perforate, entirely naked, pale yellow to lemon- 

 yellow and greenish-yellow, the hypothallus thin or scarcely 

 evident. Sporangia laterally much compressed, flexuous, and 

 gyrose, not everywhere grown together, but forming a dense 

 reticulum ; the walls a thin, pellucid membrane, with a dense 

 layer of lemon-yellow granules of lime. Capillitium of short 

 and very slender tubules, sparingly branched and scarcely 

 forming a net-work, not expanded at the angles; the tubules 

 very scantily furnished with lime, in scattered, small, fusiform 

 nodules, white or lemon - yellow. Spores globose, very 

 minutely warted, violaceous, 7-9 mic. in diameter. 



Growing on mosses, old leaves, sticks, etc.; not common. 

 Aethalia in irregular patches 2-4 cm. or more in extent, some- 

 times almost reduced to a simple plasmodiocarp. This spe- 

 cies furnishes a clear notion of the structure of the aethalium 

 in the other species, on account of the sporangia being but 

 loosely compacted and not entirely grown together. The 

 Fuligo vapor aria Pers., of the green-houses and gardens I 

 have never seen ; the Mucor septicus L,inn., was thought to 

 be the Plasmodium of this. Linnseus's description is simply 

 " Mucor unctuosus flavus." 



§2. Aethauopsis Zopf. Aethalium small ; lime abund- 

 ant in the capillitium, the nodules numerous and large, angu- 

 lar and irregular. 



4. FuiviGO muscorum A. & S. Plasmodium effused, 

 golden yellow. Aethalium small, subpulvinate, irregular, 

 the surface furnished with scattered, irregular scales of lime, 

 whitish or ochraceous to golden yellow in color, arising from 

 a thin, white, membranaceous hypothallus. Sporangia closely 

 packed and grown together ; the walls a thin, violaceous 

 membraue, rugulose, with a thin, closely adherent layer of 

 granules of lime. Capillitium a loose net-work of tubules, 

 widely expanded at the angles ; the tubules for the most 

 part filled with lime, the nodules white or yellowish, numer- 

 ous, very large, angular and irregular, sometimes confluent 

 with pointed lobes and branchlets. Spores irregularly glo- 

 bose, minutely warted, dark violaceous, 9-1 1 mic. in diameter. 



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