Fungous Flora of the Soil 451 



sporangial wall readily dissolving; columella small, occasionally appearing 

 as a hardly distinguishable swelling, globose or ellipsoidal, 6-12^ high by 

 6-i2/i wide, average 8 by lo-ii/x; spores very small, 2.5 by 2ju; zygospores 

 not observed. 



Hab. Isolated from forest soil near Christiania, Norway, Hagem. 



Mucor hiemalis Wehmer, Der Mucor der Hanfrotte, M. hiemalis nov. 

 spec. Ann. Myc. 1:37-41. ^g5. 1-9. 1903. Hagem, Untersuch. ii. 

 Norw. Mucorineen i: 24-28. figs. 5-8. 1908; reprint from 

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

 Lendner, Les Mucorinees dela Suisse, 65-68. fig. 22. 1908. ) 1 ^o 



Colonies bright gray; sporangiophores 0.5 cm. high, at 

 first erect, later frequently somewhat bending down, Fig. 103.— 1/?/- 

 monopodially branched with branches again branched, or Wehln^Show 

 also, especially in young cultures, almost entirely un- ing cohimel- 

 branched; sporangia green-black with a trace of yellow, ^colTar^ ^alfd 

 50-80^1 usually about 60^1 in diameter, with dissolving wall ; spores, x 

 columella, in young sporangia, globose, later always more ^soo 

 or less oval, 20-50^ usually 3o-40;u in diameter, with small basal collar; 

 spores rather uniform in shape, but very variable in size, usually 

 regularly ellipsoidal, occasionally flattened on one side or slightly 

 curved, 4-10 by 2.5-5/^; chlamydospores numerous in the substratum, 

 very irregular, pyriform, barrel-shaped, et cetera, seldom in the 

 sporangiophores . 



Heterothallic ; zygospores on short, 1-2 mm. high, nonseptate hyphae 

 that arise from the substratum, globose, 70-100^1 usually 80-90/x in diam- 

 eter, warty; warts very close-standing, short-rayed, starlike, black, opaque; 

 suspensors rather short and thick, uniform, usually straight, the one 

 (seldom both) in certain stages of conjugation with strong red-brown 

 contents. 



Hab. Isolated frequently from soil near Christiania, Norway, Hagem; 

 Switzerland, Lendner; Czamohora, Austria, Namyslowski; plant-breeding 

 plats, Cornell University, by the writer. Plant pathology herbarium No. 



5,897- 



Mucor microsporus Namyslowski, Studien iiber Mucorineen. Bui. 

 Acad. Sci. Cracovie, Series B. Sci. Nat., 518. June, 1910. 



Colonies whitish, with age becoming yellowish, especially when grown 

 on pears; mycelium cottony; sporangiophores unbranched, up to 2 cm. 

 high, i2-20)Li thick, below the columella strongly attenuated; sporangia 

 brownish, 30-80/i in diameter, mostly 60/i; membrane of young sporangia 

 does not dissolve in water, with age, however, it dissolves; columella 

 spherical, somewhat higher than broad, beneath weakly attenuated, always 

 with fiat base and short collar; smooth, 20-70/1 broad, often filled with 



