ASYMMETRICA-VELUTINA 341 



Penicillium corylo'pMlmn Dierckx, in Soc. Sci. Brux. 25: 86. 1901. In 

 Biourge, Monogr., La Cellule 33: fasc. 1, pp. 266-267; Col. PI. IX and 

 PI. XIV, fig. 83. 1923. Thorn, The Penieillia, pp. 254-255. 1930. 



Colonies upon Czapek's solution agar growing somewhat restrictedly, 

 attaining a diameter of 2.5 to 3.0 cm. in 10 to 12 days at room temperature, 

 consisting of a closely woven basal felt about 200 to 350m deep, tough, 

 tearing irregularly, becoming velvety in appearance with the development 

 of abundant conidial structures (fig. 91 A), strongly furrowed in a radial 

 pattern, at first white to cream-colored, becoming blue-green with the 

 development of conidia and shading through artemisia green (Ridgway, 

 PI. XLVH) or glaucous-gray (R., PI. XLVIII) shades when young to olive 

 bro\^Ti (R., PI. XL) in age, at times more or less zonate, producing limited 

 exudate as small, colorless droplets; odor evident but not distinctive; re- 

 verse in dull light brown or fuscous shades; conidium production often 

 beginning late (after 8 to 10 days), appearing first in the more crowded 

 marginal areas of adjacent colonies but soon developing more or less uni- 

 formly^ over the whole colony surface; conidiophores arising mostly from 

 the substratum in narrow marginal areas, but elsewhere as branches from 

 interwoven hyphae which comprise the basal felt, mostly 50 to 100/x by 

 2.2 to 2.5m, but ranging from 40 to 200m in length, generally unbranched, 

 smooth-walled throughout; penicilli variable in form and dimensions, 

 typically biverticillate and asymmetric but with monoverticillate struc- 

 tures sometimes predominating; penicilli typically consisting of 2 to 3 

 metulae, variable in length (figs. 9OA2 and 91D), mostly 12 to 20m by 2.0 by 

 3.0m, each supporting a group of 4 to 8 sterigmata measuring about 8 to 

 12m by 2.0 to 2.5m, with individual cells occasionally longer in otherwise 

 typical clusters; conidia subglobose to elliptical, mostly 2.5 to 3.0m in long 

 axis, with the more elliptical cells commonly measuring 3.0 to 3.2m by 2.5 

 to 2.8m, smooth- walled, in long, loosely adherent or tangled chains (fig. 

 9OA1). 



Colonies upon steep agar somewhat restricted, attaining a diameter of 

 3.0 cm. in 10 to 14 days, strongly wrinkled in a predominantly radiate 

 pattern, more or less angular in outline (fig. 91B), heavily and uniformly 

 sporing, velvety, with conidiophores arising directly from the substratum 

 or as branches from interlacing hyphae forming a loose network just above 

 the agar surface, sage green (R., PL XLVII) in j^ounger fruiting areas to 

 deep olive gray (R., PI. LI) at colony centers, droplets few and colorless, 

 reverse uncolored to light bro^vn; penicilli as on Czapek but tending to be 

 slightly larger. 



Colonies upon malt extract agar spreading broadly (fig. 91C), measuring 

 8 to 9 cm. in 10 to 14 days at room temperature, plane, strictly velvety, 

 thin, heavy sporing, gnaphalium green through pea green to celandine 



