USE OF THE MANUAL 



123 



a. Colonies producing true perithecia, parenchymatous or sclero- 



tioid throughout; ripening from the center outward and often 

 j^|.g Carpenteles series 260 



b. Colonies producing sclerotia or masses of thick-walled cells; never 



developing asci or ascospores P- raistrickti series 273 



2. Colonies not producing perithecia, sclerotia, or masses of thick-walled 



cells. 



a. Conidial areas not showing green, gray-green, or blue-green 



shades— lilac, vinaceous or avellaneous shades usually produced 



P. lilacinum series 284 



b. Conidial areas showing green, gray, gray-green, or blue-green 



shades. 

 1'. Conidial areas in pale blue-green or gray-green shades; colony 

 reverse often brightly colored, 

 aa. Conidial chains strongly divergent; sterigmata abruptly 

 tapered to narrow conidium bearing tubes 



P. janthinellum series 294 

 bb. Conidial chains tending to form columns, at least when 

 young; sterigmata not abruptly tapered 



P. canescens series 315 



2'. Conidial areas in dull gray to olive-gray shades; colony reverse 

 usually in dull yellow to orange-brown shades 



P. nigricans series 323 



B. Penicilli seldom strongly divaricate, usually compact, with branches 

 and metulae tending to be parallel rather than divergent. 

 1. Colonies typically velvety, with conidiophores arising characteristi- 

 cally from the substratum in a dense even stand 



Velutina Sub-section 336 



a. Penicilli seldom branched below the level of the metulae; sterig- 



mata not lanceolate or acuminate P. citrinum series 338 



b. Penicilli commonly branched below the level of the metulae. 



1'. Penicilli commonly long, with elements often loosely arranged, 

 aa. Conidiophores smooth-walled; colony margin not arach- 

 noid. 

 1". Colonies typically producing abundant yellow pig- 

 mentation in exudate and reverse 



P. chrysogenum series 355 



2". Colonies not producing yellow pigment in exudate and 

 reverse. 



aaa. Soil forms P- oxalicum series 376 



bbb. Green citrus rot P- digitatum series 385 



bb. Conidiophores rough-walled; colony margin arachnoid 



P. roqueforti series 392 

 2'. Penicilli comparatively short, compact, vnth. all elements com- 

 pressed P- brevi-compactum series 404 



2. Colonies typically lanose or floccose, with conidiophores commonly 

 long, usually arising as branches from aerial hyphae or from the 

 substratum in marginal areas in older colonies... Lanata Sub-section 419 

 a. Colonies predominantly white and remaining so, or becoming light 

 gray-green with the development of ripe conidia 



P. camemberti series 421 



