Fungous Flora of the Soil 455 



with more or less plain basal collar and likewise as the sporangial stalk 

 with smooth wall and colorless contents; spores oval or subcylindrical, 

 4 by 2/x or 5 by 3iu (to maximum 8 by 6n). 



HeterothalHc ; zygospores produced ladder-like on the sporangiophores, 

 black, opaque, with plate-like, slightly raised elevations; azygospores 

 numerous, seldom single, mostly double. 



Hab. Isolated frequently from acid soil of forests near Christiania, 

 Norway, Hagem. 



Mucor racemosus Fresenius, Beitr. Myc. 12. 18 so. Fischer, Rab. 

 Krypt. Flora Abt. 4, i: 192-194. 1892. Hagem, Unter- 

 such. ii. Norw. Mucorineen i: 24. 1908; reprint from 

 Vid.-Selsk. Skr. I, Math.-Naturv. Klasse No. 7, 1907. 

 Lendner, Les Mucorinees de la Suisse, 77. 1908. 



Sporangiophores rigid, erect, 5-40 mm. long by 8-2 oju 

 thick, branched, with side branches sometimes branched; 

 in mass dirty Hght yellowish; sporangia small, spherical, 

 20-70/x in diameter, erect, single, often reflexed, dirty 

 yellow, wax yellow, or yellowish brown, transparent. Fig. 105.— ilfw- 

 sporangial wall smooth, not dissolving in water, but breaking ^'' racemosus 

 open, often remaining long intact; columella hyaline, of spomngio- 

 broad clavate to short ovate, 14-60^ long by 7-4 5 abroad, phore, showing 



iZ L CL 111/ y (2/ ^ 



occasionally spherical or broad campanulate, with color- spores, x 236.6; 

 less smooth membrane; spores hyaline to dirty yellow, ■^.' ^^°^V^7 

 short ellipsoidal to globose, sometimes somewhat angled, c, columella, x 

 variable in size 4-8 by 4-iojLi, smooth. ^^^'^ ' ?x 



HeterothalHc; zygospores globose, 70-85^1 m diameter, 

 brown, warty exospore, suspensors smaller than spore; chlamydospores 

 globose to oblong, globose measure io-2 0;u, oblong 10-20 by 25-30/i, 

 hyaline or yellowish guttulate, thick, smooth membrane. 



Hab. Isolated from sandy and loamy arable soil, Germany, Adametz; 

 from sandy-loamy soil from potato field. Long Island, N. Y., by the 

 writer. Plant pathology herbarium No. 5,899. 



Mucor flavus Bainier, Sur quelques especes de Mucorin6es nouvelles ou 

 peu connues. Bui. Soc. Myc. France 19: 158. 1906. Hagem, Unter- 

 such. u. Norw. Mucorineen i: 21-22. fig. j. 1908; reprint from Vid.- 

 Selsk. Skr. I, Math.-Naturv. Klasse No. 7, 1907. Lendner, Les Muco- 

 rinees de la Suisse, 79. 1908. 



Sporangiophores attain on sterilized bread a height of 6 cm. and are 

 usually 25-35/1 thick, monopodially branched with long ascending branches 

 that are again occasionally branched, in young cultures colorless, in old, 

 yellow; sporangia at first white, then becoming blue-gray and finally 

 yellow; colimiella in young sporangia frequently globose, in mature spo- 



