86 
CHARLES THOM AND MARGARET B. CHURCH 
Chromotaxia)^ to deeper brown shades in age (see Ridgway, PI. 
XXIX, 15'^ Klincksieck and Valette, Nos. 103D, 112, 113, 108);^ 
spreading, velvety or in some strains developing definite floccosity 
or anastomosing ropes of aerial hyphae; reverse and agar from pale 
or bright yellow to fairly deep browns. Odor, none in some strains, 
at least transiently present in others, or developing with the addition 
of high percentages of cane sugar. Conidiophores 5-8 fx in diameter, 
50-150 At or even 250/^ in length, more or less flexuous, with walls 
smooth, up to I thick, septate or unseptate, with apex enlarged to 
Fig. I. A. terreus. a, semidiagrammatic section of vesicle and sterigmata; 
b, c, d, primary and secondary sterigmata, X 1,500; e, conidia, X 1,500; /, diagram 
of stalk and base of calyptrate conidial mass. 
Fig. 2. A. terreus. Photograph of colony on Petri dish of Czapek's medium. 
form a vesicle commonly 12-18 fi, occasionally up to 25 yu in diameter, 
bearing sterigmata usually in two series upon its dome-like upper 
surface; primary sterigmata 2-2.5 M by 7-9 ^i, secondary 2-2.5 by 
5-7 iJL closely packed ; heads becoming solid columnar masses up to 
500 ju long by 50 in diameter; conidia slightly elliptical to globose, 
2.2-2.5 M or even to 3 ^ in diameter, smooth, in long, parallel, adherent 
chains. Perithecia not found. Grows at 37° C. Liquefies gelatin. 
Habitat, — Common in soil and in decaying vegetable matter, 
throughout the United States. 
Turesson^ reports the spores of this species as viable after passing 
4 SaccardOs P. A. Chromotaxia seu Nomenclator Colorum, Patavii. 1891. 
5 Ridgway, Robert. Color standards and color nomenclature. Washington, 
D. C. 1912. 
6 Turesson, Gote. Bot. Tidskr. 10: 1-27. 1916. 
