212 A MANUAL or THE PENICILLIA 



received as Penicillium dierckxii Biourge duplicates the one received as 

 P. decumbens and should properly be regarded as belonging to the latter 

 species. 



Penicillium fellutanum Biourge, in Monograph, La Cellule 33: fasc. 1, pp. 



262-264, Col. PI. XIII and PI. XXIII, fig. 133. 1923. See also 



Thorn, The PenicilHa, pp. 198-199, fig. 25. 1930. 



Colonies on Czapek's solution agar restricted in growth, about 2.0 to 

 2.5 cm. in diameter in 12 to 14 days at room temperature, consisting of a 

 tough, closely woven felt of fine hyphae, 100 to 200/x in depth (fig. 59 A), 

 with margin thin and often extending beyond the colony margin as a 

 narrow zone of predominantly submerged growth, composed of funiculose 

 stolon-like hyphae, becoming deeper and almost umbonate at colony 

 center, radiately wrinkled, narrowly zonate, in some strains light sporing, 

 with central colony area commonly remaining white, developing marginal 

 conidial areas in bluish green shades near gnaphalium green to sage green 

 (Ridgway, PL XL VII), becoming slate-ohve in age; exudate lacking or 

 limited in amount, when present produced as small droplets, clear or very 

 light amber; odor distinct, rather pleasant; reverse cream to flesh colored 

 or in light vinaceous gray shades, in some strains showing some green; 

 conidiophores usually 50 to lOO^t in length by 2.0 to 2.5jLi in diameter, 

 smooth- walled, arising from a closely woven felt, or from trailing or pros- 

 trate creeping hyphae, generally enlarging upward to form more or less 

 well-defined vesicles with upper surface often definitely flattened and from 

 4.0 to 5.0/x in diameter; penicilli usually strictly monoverticillate but 

 occasionally showing a branch which retains its monoverticillate structure, 

 conidia borne in poorly defined columns up to lOO/x in length; sterigmata in 

 compact verticils up to 8 to 12 in number, usually 6 to 8/i by 1.5 to 2.2/i 

 (fig. 59D); conidia elliptical to subglobose, mostly about 2.5 to 3.0/i in 

 long axis, fairly heavy-walled and smooth or finely roughened, dull green 

 in mass. 



Colonies on steep agar differ little from those on Czapek but are some- 

 what faster growing, 3.0 to 3.5 cm. in diameter in 2 weeks, generally deeper, 

 more heavily sporing (fig. 59B), mostly in dark green shades, and with 

 masses of conidia somewhat heavier; conidiophores up to 300iu long in 

 some strains, commonly arising from the substratum; penicilli structurally 

 as on Czapek except sterigmata are more numerous, often in clusters of 

 12 to 15. 



Colonies on malt extract agar restricted, about 1.5 to 2.0 cm. in diameter, 

 plane except slightly umbonate at center (fig. 59C), generally heavy spor- 

 ing; conidiophores and penicilli as on Czapek but bearing loose columns of 

 spores up to 200/i in length on conidiophores up to 150 to 200^. 



