564 A MANUAL OF THE PENICILLIA 



Page 

 1'. Colonies restricted, close-textured, usually strongly folded or 

 wrinkled, 

 aa. Conidia elliptical, conspicuously rugulose; penicilli typi- 

 cally biverticillate-symmetrical but often irregular in 



pattern P. rugulosum Thorn 648 



bb. Conidia strongly elliptical, smooth or slightly and irregu- 

 larljr roughened; penicilli more consistently biverticillate- 

 symmetrical P. variabile Sopp 



(in the P. purpurogenum series) 

 2'. Colonies very restricted, or very thin and plane but with central 

 area commonly raised or floccose. 

 aa. Colonies very thin throughout or with central area some- 

 what floccose, growing more or less restrictedly upon all 



substrata P. tardum Thom 651 



bb. Colonies growing very restrictedly upon Czapek, but heavily 

 sporing and broadly spreading on media containing am- 

 monium nitrogen P. diversum Raper and Fennell 653 



1". Colonies producing abundant yellow, much branched 

 mycelia on malt, often tending to characterize the 

 culture. ..P. diversum var. aureum Raper and Fennell 655 

 3. Colonies with surface appearing almost lanose, loose-textured, com- 

 paratively deep; vegetative mycelium typically in yellow-green 

 shades; conidiophores long and coarse, usually roughened; reverse 

 deep to dark yellow-green, brown, or almost black, but seldom de- 

 veloping true reds P. herquei series 658 



a. Sclerotia lacking or rarely produced and limited in number; metulae 



numerous and somewhat divaricate; conidia elliptical. 

 1'. Conidiophores usually less than 1 mm. in length and 4.0 to 



4.5^4 in diameter P. herquei Bainier and. Sartory 659 



2'. Conidiophores commonly 1 mm. or more, and up to 2 mm., in 



length by about Spin diameter, P. olsoni Bainier and Sartory 664 



b. Sclerotia very abundant, characterizing the species; metulae 3 to 5 



in number, in compact verticils; conidia globose. 



P. novae-zeelandiae van Beyma 665 



Penicillium luteum Series 

 Outstanding Characters 



Perithecia characteristically produced, mostly in bright yellow to golden 

 yellow or orange-yellow shades, soft, with growth indeterminate, in- 

 dividually consisting of fertile tissue bearing abundant asci bounded 

 by a thin covering of interlacing hyphae which may range from very 

 loose to closely knit but shows little or no cellular modification, typically 

 surrounded by a loose mantle of coarse, encrusted, and richly pigmented 

 hyphae. 



Asci borne in chains, or singly as branches from ascogenous hyphae, 8- 

 spored; ascospores variable, usually elliptical and showing no evidence 



