Fungous Flora of the Soil 453 



Sporangiophores erect, with colorless membrane and colorless or weak- 

 yellow scanty contents, forming a thick silver-gray glistening sward over 

 the entire substrattim, usually unbranched, 2-15 cm. 

 long by 30-40^1 thick, nonseptate, occasionally, especially 

 the first from young mycelium, much shorter and with 

 a side branch; sporangia large, globose, 100-200/1 in 

 diameter, at first yellowish, later when dry becoming dark- 

 gray or black-brown, occasionally with greenish shimmer, 

 thick fine-spiny; sporangial wall quickly dissolving, 

 leaving generally a basal collar; columella high-cylindri- 

 cal or bell-shaped or globose, 70-140/1 high by 50-80/x ^mticedo {Linn7) 

 broad, with smooth, colorless membrane and mostly with Bref. A, part of 

 orange-yellow contents; spores round cylindrical to long iJww'uigocca- 

 ellipsoidal, twice as long as broad, very uniform in sional branch- 

 shape, variable in size 6-12 by 3-6/x (extreme forms sporangium', x 



16.8/1 long), with colorless smooth membrane, weak- 60; C, colu- 

 11 ,1 , , mella. x 60; D, 



yellow or colorless contents. spores x 236.6 



Heterothallic ; zygospores globose, 90-2 50/t in diameter; 

 exospore black, with thick projecting tubercles; endospore colorless; 

 contents colorless, with large oil drop; zygospores in our cultiu-es not 

 observed. 



Hab. Isolated from soil by Hagem, near Christiania; Cracovie, Aus- 

 tria, Namyslowski; Germany, Adametz; by the writer frequently from 

 oat field and experimental plats of Plant-Breeding Department, New 

 York State College of Agriculture, Cornell University, Ithaca, N. Y. 

 Plant pathology herbarium No. 5,898. 



Racemo-mucor 



Mucor Christianiensis Hagem, Neue Untersuch. ii. Norw. Mucorineen. 

 Ann. Myc. 8: 268-272. figs. 2-3. 1910. 



Colonies on agar consisting first of a thick gray mycelial membrane 

 covering the surface of the substratum, finally there occurs a sparse forma- 

 tion of sporangiophores. Sporangiophores mostly scattered, seldom 

 forming loose tufts 1.5-2.5 cm. high, generally thin 6-10/1 thick and there- 

 fore soon falling, when young unbranched, older monopodially branched 

 with few short upward-bent branches, with numerous chlamydospores, 

 at maturity finally breaking into pieces. Chlamydospores in the sporan- 

 giophore at first cylindrical, later barrel-shaped or mostly spherical, 

 rather regularly interspersed every 50-2 00/t, at maturity quickly becoming 

 ripe and free. Sporangia small, usually 40-60/1 in diameter, at maturity 

 of bright yellow color, with wall that breaks, leaving finally only a collar 

 at the base of the columella. Coltunella oval or mostly ovate, toward 



