194 A MANUAL OF THE PENICILLIA 



more in length; sterigmata about 8 to 10/i by 2.0 to 2.5/x with conidium 

 bearing tips definitely narrowed (fig. 53C), conidia strongly elliptical, 

 almost fusiform, about 3.0 to 3.5/i by 2.0 to 2.5m, with ends usually some- 

 what pointed and with walls delicately roughened, sometimes appearing 

 smooth. 



Colonies on steep agar as above but generally somewhat deeper and 

 regularly heavier sporing, uniformly colored throughout, approximately 

 pea green (R., PI. XLVII) to storm gray (R., PI. LII); odor and exudate 

 lacking; reverse in light drab shades; conidial structures as described on 

 Czapek but with conidiophores commonly more than 500^ in length and 

 conidial chains up to 200ju; details of the penicillus as above. 



Colonies on malt agar spreading broadly, G to 7 cm. in 10 to 12 days, 

 comparatively deep, loose-textured with growing margin broad, white, 

 about 5 mm., light gray-green near gnaphalium green to pea green (R., 

 PI. XLVII), remaining essentially unchanged in age; reverse in dull yellow- 

 orange shades; conidial structures as described above. 



Species diagnosis centered upon a strain isolated by Stapp and Bortels 

 (1935) from a beech forest in Berlin and used as the type of their new 

 species, Penicillium roseo-viridum. It is now maintained as NRRL 760. 

 A second substrain of the same culture, received from the Centraalbureau 

 in August 1946, duplicates NRRL 760. When first examined in 1936, 

 Thom recognized Stapp and Bortel's strain as unquestionably represent- 

 ing P. aurantio-violaceum Biourge, hence considered their species as syn- 

 onymous with that earlier described by Biourge. 



NRRL 762, received in 1940 from Professor R. A. Toro, University of 

 Puerto Rico, Mayaguez, P. R., differs from the above in producing colonies 

 consistently more floccose, with appreciable sterile iiyphae, and with more 

 strongly roughened conidiophores. The structure of the penicillus and 

 the size and shape of the conidia duplicate NRRL 760 as discussed above. 



Penicillium trzehinskii Zaleski, in Bui. Acad. Polonaise Sci.: Math, et Nat., 

 Ser. B, 1927, pp. 489-499; Taf. 58. Thom, The Penicillia, p. 189. 



1930. 



Colonies on Czapek's solution agar attaining a diameter of 2.0 to 2.5 

 cm. in 10 to 12 days at room temperature, consisting of a tough basal 

 felt with thin aerial growth appearing almost floccose, strongly and ir- 

 regularly wrinkled and somewhat radially furro\\^ed, azonate (fig. 53D), 

 light to medium sporing throughout, in pale gray-green shades from an 

 admixture of conidial heads and sterile aerial hyphae ; no exudate produced ; 

 odor lacking or indefinite; reverse quickly developing deep dull violet to 

 dark fuscous shades, with surrounding agar similarly colored; conidio- 

 phores limited to abundant, sometimes arising from submerged hyphae, 



