610 A MANUAL OF THE PENICILLIA 



Penicilli typically biverticillate and symmetrical; occasionally appearing 



asymmetric or fractional. 

 Sterigmata lanceolate in pattern, characteristic of the section. 



The series is represented by a single well-marked species, Pemcillium 

 dudauxi Delacroix. Superficially, this fungus is suggestive of P. davigerum 

 Demelius, a strongly coremiform member of the Fasciculata. It is easily 

 differentiated from the latter, however, by the character of its penicilli, 

 the presence of abundant yellow to orange-red pigmented hyphae, and the 

 production of deep orange to red colors in reverse. 



Recognition of a separate series is based upon the unique cultural char- 

 acteristics of the species which typifies it. 



Penicillium dudauxi Delacroix, in Bui. Soc. Myc. France 8: 107, PI. VII. 



1891. Thom, U. S. D. A., Bur. Anim. Ind., Bui. 118, p. 42, fig. 9. 



1910; also The Penicillia, pp. 458-459, figs. 72 and 73. 1930. 



Colonies on Czapek's solution agar growing rather slowly, attaining a 

 diameter of 2 to 3 cm. in 12 to 14 days at room temperature, consisting of 

 a fairly tough basal felt from which arise abundant fascicles (fig. 158A), 

 mostly as true coremia 1-2 mm. high, but frequently as irregular tufts or 

 masses of funiculose hyphae, often more or less zonate, variable in color, 

 often predominantly in light yellow-green to flesh or reddish shades from 

 the development of abundant masses and tufts of encrusted vegetative 

 mycelium, sporulating irregularly, conidial areas in yellow-green shades 

 near Andover green to slate olive (Ridgway, PI. XLVII); exudate lacking 

 to fairly abundant, in dull j^ellow to light brown shades; odor limited, sug- 

 gesting mushrooms; reverse variously colored, at first yellow, then orange- 

 red to deep red or brownish black shades, with surrounding agar similarly 

 colored in lighter shades; conidiophores arising primarily from coremia or 

 tufts of aerial hyphae (fig. 158C'), less commonly directly from the sub- 

 stratum, variable in length up to 200 to 300/i by 2.5 to 3.0/u when arising 

 from the substratum, or 1 mm. or more when aggregated into coremia, ^^^th 

 walls ranging from smooth to definitely roughened; penicilli typically bi- 

 verticillate and symmetrical (fig. 158D), consisting of a single terminal 

 verticil of metulae, often fragmentary, not infrequently branched and ap- 

 pearing more or less one-sided, but with sterigmata in all cases showing the 

 typical lanceolate pattern of the group; metulae usually in verticils of 2 to 5 

 measuring 8 to lOyu by 2.5 to 3.0)u, sometimes rebranched below the level 

 of the sterigmatic cells; sterigmata closely parallel, 3 to 6 in the verticil, 

 mostly 8 to 12/x by 2.0 to 2.5/x; conidia elliptical to subglobose, heavy- 

 walled, often somewhat roughened in a more or less spiral pattern, borne 

 in tangled chains 50 to 75m in length. 



Colonies on steep agar growing somewhat more rapidly, 3 to 4 cm. in 



