FuNGOu§ Flora of the Soil 465 



(20-26 IX against 24-28/1), and the smaller globose spores commingled with 

 the larger elliptical ones. 



Mortierella pusilla Oud., Contrib. Fl. Myc. des Pays-Basser. 2, 19: 876. 

 1901; Arch. Neerl. Sci. Nat. ser. 2, 7: 277. pi. 3, fig. i. 1902. Lendner, 

 Les Mucorinees de la Suisse, 155-156. 1908. 



Colonies orbicular, constantly snow-white, floccose with few super- 

 posed layers that are repand or lobate, the layers diminish in number 

 toward center; vegetative hyphas hyaline, 2.5-ioju thick, dichotomously 

 branched, with protoplasm dense and full of minute granules; fertile 

 hyphas, 4-6/1 in diameter, downward slightly thickened, upward slightly 

 attenuate, 130-170/x high, terminating singly in sporangia; sporangia 

 globose, smooth, 2 4-2 8 /x in diameter, membrane hyaline; spores globose, 

 smooth, hyaline, 2-2. 5/i in diameter, variously guttulate to not at all. 



Hab. Isolated from humous soil from Spanderswoud near Bussum, 

 Holland, March, 1901, Koning. 



Differs from M. isahellina in colonies having lamellate texture and being 

 constantly white; in vegetative hyphse having dense protoplasm that is 

 full of minute granules; in conidiophores being attenuate toward tip; and 

 in having hyaline spores. 



Mortierella isahellina Oud., Contrib. Fl. Myc. des Pays-Basser. 2, 19: 

 875. 1901; Arch. Neerl. Sci. Nat. ser. 2, 7: 276. pi. 2, fig. i. 1902. 

 Lendner, Les Mucorinees de la Suisse, 156-157. 1908. ' 



Colonies zonate, at first white, then bright gray, finally isabel-colored 

 (Sacc. Chromot. No. 8), somewhat rougher with age; vegetative hyphs 

 dichotomously branched, continuous, with protoplasm equally dense; 

 fertile hyphas erect, cyHndrical, upward sHghtly more slender, continuous, 

 120-200/X high, hyaline, ending singly in sporangia; sporangia globose, 

 1 2-15/1 in diameter, smooth, membrane hyaline; spores globose, smooth, 

 solitary, almost hyaline, in mass very dilute pale yellow, 2-5/t in diameter; 

 chlamydospores submerged in medium, spherical to elHptical, smooth, 

 hyaline, membrane thin. 



Hab. Isolated from humous soil from Spanderswoud near Bussum, 

 Holland, March, 1901, Koning. 



Differs from M. simplici in the color of the colonies when in state of 

 active growth; in color and dimensions of spores (2-5 against lo/x), also 

 in their enucleate condition. 



Mortierella humicola Oud., Contrib. Fl. Myc. des Pays-Basser. 2, 19: 

 875. 1901; Arch. Neerl. Sci. Nat. ser. 2, 7: 276. pi. i, figs. 1-3. 1902. 

 Lendner, Les Mucorinees de la Suisse, 56. 1908. 



Colonies orbicular, nonlamellate, constantly snow-white; vegetative 

 hyphas dichotomously branched, hyaline, continuous, everywhere with 

 swellings, with protoplasm full of small granules; fertile hyphas perfectly 



