540 A MANUAL OF THE PENICILLIA 



Series Key 



1. Fascicles or coremia predominating but interspersed with abundant simple co- 

 nidiophores; conidiophore walls roughened P. granulatum series 



a. Conidia globose to subglobose; colonies 1.0-2.0 mm. deep; conidial areas in yel- 



low-green to dark yellow-green shades; odor usually not pronounced. 



P. corynibiferum Westling 



b. Conidia elliptical; colonies 2.0-4.0 mm. deep; in pale blue-green to glaucous 



shades; odor pronounced, aromatic P- granulatum Bainier 



Two fairly well differentiated species comprise the series, namely: Peni- 

 cillium corymhifenmi Westling and P. granulatum Bainier. Both species 

 are characterized by the production of abundant and conspicuous fascicles 

 or loosely constructed coremia that are more highly developed than those of 

 the several series previously considered but less so than those of the P. 

 daviforme series which follows. Penicilli are quite large, usually branched, 

 and are consistently borne upon conidiophores with conspicuously rough- 

 ened walls. The series seems to grade almost imperceptibly into the P. ex- 

 pansum series, for individual isolates which appear transitional between 

 the two series are not infrequently encountered. Such intermediate forms, 

 however, rot apples very slowly if at all, hence appear to be characterized 

 by physiological differences which separate them from the P. expansum 



series. 



Members of the series may be regarded primarily as soil forms and ap- 

 pear to be fairly widely distributed in nature. Penicillium corymhiferum 

 commonly occurs upon liliaceous bulbs and root stocks and under certain 

 conditions may become pathogenic. 



Freshly isolated strains usually present a strongly fasciculate appear- 

 ance which represents the typical cultural aspect of the series, whereas 

 strains long maintained in laboratory culture often tend to lose this char- 

 acter and to become either increasingly fioccose or almost velvety. 



Penicillium corymhijerum. Westling, in Arkiv for Botanik 11: 56, 92-95; 

 figs. 16, 58. 1911. Thom, The Penicillia, pp. 423-425. 1930. 



Colonies on Czapek's solution agar (Col. PI. VIII) growing rapidly, at- 

 taining a diameter of 4.5 to 5.0 cm. in 8 to 10 days, up to 1.0 to 2.0 mm. 

 deep in central to subcentral areas, azonate or indistinctly zonate near 

 colony margins, strongly fasciculate (fig. 139A), with surface appearing 

 coarsely granular or ridged and with the majority of conidiophores aggre- 

 gated into clearly defined bundles easily viewed at the colony margin (fig. 

 139C) or in radial colony sections, heavily sporing throughout, with grow- 

 ing margin and secondary tufts of vegetative hyphae and developing 

 conidiophores white to pale yellow, passing through yellow-green shades 

 near pea green to sage green (Ridgway, PI. XL VII) with the development 

 of mature conidia, and becoming slate-olive (R., PI. XL VII) in age; exudate 



