562 A MANUAL OF TTHE PENtOlLLIA 



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2'. Ascospores with conspicuous transverse (spiral) bands ("tricos- 

 tate" of Zukal); perithecia in bright yellow shades. 



P. luteum Zukal 600 

 3'. Ascospores with multiple longitudinal ridges; perithecia white 



or cream colored P. striatum Raper and Fennell 603 



B. Colonies producing sclerotia in greater or less abundance upon most sub- 

 strata. 



1. Sclerotia in dark red or blackish shades, often elongate; penicilli typi- 



cally biverticillate and symmetrical. 



a. Sclerotia dark red or reddish black in color, usually more or less 



rounded and borne upon the substratum. 



P. purpurogenum var. rubri-sclerotium Thom 636 



b. Sclerotia black, brownish black, or greenish black, usually elongate, 



often more or less embedded in the substratum. 

 1'. Sclerotia abundantly produced, often characterizing the cul- 

 ture; conidiophores and metulae conspicuously roughened. 



P. novae-zeelandiae v. Beyma 665 

 2'. Sclerotia sparsely and tardily produced in occasional strains; 

 conidiophores and metulae smooth-walled or nearly so. 



P. funiculosum Thom 616 

 3'. Sclerotia reported; conidiophores long and comparatively coarse, 

 usually rough-walled, at least in the terminal area. 



P. herquei series 658 



2. Sclerotia in light cream to yellow shades, rounded; penicilli bivertic- 



illate, sometimes appearing symmetrical. 



P. raistrickii Smith and allied species 

 (in the Divaricata, p. 255) 

 II. Colonies not producing perithecia or sclerotia. 



A. Colonies regularly developing abundant, erect coremia, often character- 



izing the culture. 



1. Penicilli typically biverticillate and symmetrical; sterigmata lanceo- 



late, with tips gradually tapered; colonies developing yellow-orange 



or red shades in reverse P. duclauxi series 609 



P. duclauxi Delacroix 610 



2. Penicilli typically asymmetrical; sterigmata with tips more abruptly 



narrowed; colonies seldom developing true red shades in reverse. 



P. clavifonne series 

 (in the Fasciculata, p. 548) 



B. Colonies seldom or never developing true coremia. 



1. Colonies with surface appearing funiculose, floccose-funiculose, or 

 somewhat tufted; conidiophores arising primarily from aerial hyphae 



or ropes of hyphae P. funiculosum series 614 



a. Conidial chains tangled or divergent; metulae parallel or somewhat 

 divergent. 

 1'. Colonies usually spreading broadly upon most substrata. 



aa. Conidia elliptical to subglobose, smooth or nearly so; re- 

 verse in pink to deep red or orange-brown shades, occa- 

 sionally almost black P. funiculosum Thom 616 



