ASYMMETKICA-FASCICULATA 471 



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

 glaucous shades; odor pronounced, aromatic. 



P. granvlatum Bainier 544 

 2. Coremia prominent, with simple conidiophores few in number or 



lacking; conidiophore walls smooth P. claviforme series 548 



a. Coremia typically club-shaped and showing clear differentiation 



into a compact fibrous stalk and an expanded "sporehead" com- 

 posed of massed and interwoven penicilli P. claviforme Bainier 549 



b. Coremia typically loose in texture (Isaria-like), often not clearly 



differentiated into stalk and "sporehead"; commonly appearing 

 feathery with penicilli usually separate. P. clavigerum Demelius 553 



Penicillium gladioli Series 

 Outstanding Characters 



Sclerotia characteristically produced, varying in number in different 

 isolates and depending upon environmental factors, particularly tem- 

 perature; usually produced abundantly at temperatures of 25°C. and 

 above, scantily at 15°C. and below. 



Conidiophores arising primarily from the substratum, mostly as inde- 

 pendent structures but often more or less aggregated into definite 

 fascicles, the latter usually more pronounced at low incubation tempera- 

 tures; with walls roughened. 



Penicilli comparatively large, usually consisting of one or two branches in 

 addition to the main axis and each major element terminating in metulae 

 bearing sterigmatic cells and conidia in tangled to loosely parallel chains. 



Commonly producing a storage rot in gladiolus corms. 



This series is represented by a single well-defined species, Penicillium 

 gladioli Machacek. Considerable variation is encountered among strains 

 newly isolated, and cultures long maintained in culture often tend to be- 

 come more floccose and to produce relatively fewer sclerotia. Members 

 of the series are differentiated from the sclerotium-forming species of the 

 P. raistrickii series primarily upon the bases of their larger and looser 

 conidial structures and the normal development of definite fasciculation 

 of conidiophores. 



Strains of Penicillium italicum Wehmer (see p. 526), when freshly iso- 

 lated, sometimes produce sclerotia and might conceivably be confused with 

 members of this series. These, however, differ in the substrata from which 

 they are regularly obtained (i.e. citrus fruit), they produce abundant 

 conidia at room temperature and usually show a more consistent and 

 marked fasciculation, conidiophores are smooth-walled, and conidia are 

 usually larger and more conspicuously elliptical. 



Penicillium gladioli Machacek, in Quebec Soc. for the Protection of Plants 

 Ann. Rpt. 19: (1926-27): 77-86. 1928. Independently published 



