544 A MANUAL OF THE PENICILLIA 



fairly thin, \vith fasciculation evident but not pronounced; exudate is 

 lacking or very limited in amount and almost colorless; and colonies in 

 reverse never develop the dark shades described above. 



Strain NRRL 997 was received from George Smith, London School of 

 Hygiene and Tropical Medicine, in 1935 as Pemcillium. conjmbiferum and 

 was then regarded by the authors as typical of this species. The culture 

 now is essentially like our current stock of NRRL 996 as described above. 



Strain NRRL 998, received in 1925 from Miss Clara Pratt, Imperial 

 College, South Kensington, London and long maintained in the Thom 

 Collection as No. 481 IZ, shows a similar reduction in exudate production, 

 in intensity of color in colony reverse, and in the degree of fasciculation. 

 The latter culture was regarded by Thom (1930, p. 426) as possibly repre- 

 sentative of PenicilUum hirsutum Dierclvx although he then pointed out 

 that this species could probably not be satisfactorily separated from P. 

 conjmbijerwn. Like NRRL 996 and 997, NRRL 998 in its present form, 

 produces penicilli and supporting structures entirely characteristic of P. 

 corymhiferum. We have no reason to question the continued purity of any 

 of the above mentioned strains. 



Strains variously diagnosed as PenicilUum corymhiferum Westling or 

 P. hirsutum Dierckx have been commonly isolated from liliaceous bulbs 

 and root crops. They seem to represent soil forms which not uncommonly 

 may become parasitic or semi-parasitic. The yellow-stalked fascicles sug- 

 gest the yellow coremia shown among Corda's figures of his genus Co- 

 remium. 



PenicilUum hirsutum Dierckx (Soc. Scientifique Bruxelles 25: 89. 1901) was re- 

 described by Biourge (Monogr., La Cellule 33: fasc. 1, pp. 157-159; Col. PI. II and 

 PI. Ill, fig. 18. 1923) but no satisfactory type culture was distributed by him. 

 Thom (1930, p. 425) presented Biourge's description together with his own culture 

 notes on certain strains which he believed to approximate the culture studied by 

 Biourge. At that time, however, he questioned the validity of the species and sug- 

 gested that it might better be regarded as a synonym of P. corymhiferum Westling, 

 since Dierckx's description was hopelessly inadequate and since Biourge's redescrip- 

 tion was antedated by Westling's. Our re-examination of the different species 

 descriptions and comparative observation of cultures reputed to represent the two 

 species confirm this opinion. 



PenicilUum granulatum Bainier, in Bui. Soc. Mycol. France 21: 126-127; 



PI. 11, figs. 5-7. 1905; Thom, U. S. Dept. Agr., Bur. Anim. Ind., Bui. 



118, pp. 44-45, fig. 11. 1910; also The Penicillia, pp. 429-430, figs. 66 



and 67. 1930. 



Colonies on Czapek's soluti(jn agar growing rather restrictedly, approx- 

 imately 2.0 to 3.0 cm. in 12 to 14 days at room temperature, comparatively 

 deep, up to 2.0 to 4.0 mm., more or less flocculent with abundant sterile 



