Fungous Flora of the Soil 



457 



8o/i in diameter; the lateral sporangia are variable and some are 

 very small; columella variable in form and size, hyaline, globose, 

 campanulate or panduriform, 60 by 44^, or 55 by 38;u, or 30 by 20/x, 

 and much smaller, usually without basal collar; spores hyaline, globose, 

 average Sn, maximum lo/i, not rarely encountered as small as 5-6/i; 

 appearing polyhedral because of their siu-face presenting very slight 

 roughness. 



Hab. Isolated from soil, Geneva, Switzerland, Lendner. 



var. minor n. var. 



Differs from species in having brownish black sporangia, thicker spo- 

 rangiophores (up to 30ju), and in the smaller spores, which appear perfectly 

 smooth. Spores average 6;u in diameter, 

 extremes 8)u and 4. 5m I chlamydospores of 

 mycelium lemon-shaped, 16-22 by 10-16^. 



Hab. Isolated from soil of plant-breeding 

 plats, Cornell University, November and 

 December, 19 10, and from flowerpot soil 

 from horticultural greenhouses, March, 191 1, 

 Ithaca, N. Y., by the writer. Plant pathology 

 herbarium No. 5,900. 



Mucor lamprosporus Lendner, Bui. Herb. 

 Boissier No. i, 8: — . 1908; Les Mucorinees 

 de la Suisse, 92-93. fig. jj. 1908. 



On 10 per cent wort-gelatin, the colony 



forms a pale gray, dense sward 3 cm. above Fig. 106. — Mucor botryoides 

 ,1 -u 4. . -1 Lendner var. minor. A, spo- 



the substratum; sporangiophores very rangiophores, showing sporangia 



irregularly branched in clusters or s^nnpodia. o"^ method of bramhing, x go; 

 Part of the branches situated at the level 

 of the substratum carry the small circinate 

 sporangia (30-40^ in diameter), which are indehiscent and deciduous. 

 When they are numerous, the substratum appears velvety and greenish 

 black; the large sporangia are diffluent in water, leaving a basal collar- 

 ette, 60/x in diameter (maximum 90/x) ; columella globose or ovoid, often 

 broader at the base than at the summit, 20^ in diameter, or 24 by 28^; 

 spores hyaline, transparent, very refringent, globose, large, mean diameter 

 lo/x, maximum diameter 12/1, minimum y/x. 



Hab. Forest soil, summit of Vuache, Savoie, Lendner. 



Mucor circinelloides van Tieghem, Nouvelles Recherches sur les INIuco- 

 rinees. Ann. Sci. Nat., Bot. Ser. 6, i: 94. 1875. Fischer, Rab. Krypt. 

 Flora Abt. 4, i: 204. 1892. Hagem, Untersuch. ii. Norw. Mxicorineen 

 1 : 34-37. _/ig. I J. 1908; reprint from Vid.-Selsk. Skr. I, Math.-Naturv. 

 Klasse No. 7, 1907. 

 22 



B, spores, xjj^; C, columella, 

 X355 



