664 A MANUAL OF THE PENICILLIA 



manifestly biverticillate; perithecia (sclerotia) were observed and reported to consist 

 of thick-walled parenchyma-like cells held together in clumps by reddish brown 

 hyphae. The species was reported to produce a "wonderful rose oil odor," a char- 

 acteristic which is rather common to several members of the Biverticillata-Sym- 

 metrica. The species is regarded as inseparable from P. herquei Bainier and Sartory. 



Penicillium olsoni Bainier and Sartory, in Ann. My col. 10: 398-399; PI. VI. 

 figs. 1-8. 1912; Thorn, The PenicilHa, pp. 471-472. 1930. 



This species is regarded as closely related to Penicillium herquei Bainier 

 and Sartory, but separable from it primarily upon the basis of its longer 

 and very coarse conidiophores. No culture representative of the species 

 has been available for the present study, and the following species diagnosis 

 is based upon the original description, and Thom's notes on a culture which 

 he believed to represent this species (Monograph, pp. 471-472. 1930). 



Bainier and Sartory's description (condensed in Thom's Monograph): 



"Colonies on banana forming tufts bluish (compare C.d.C. 378') becoming grayish 

 blue-green (C.d.C. 372, 373) in age sordid yellow -green; conidiophores erect, rigid, 

 up to 8.4/i in diameter and comparatively very long, branches wanting or produced 

 occasionally in age far down on the stalk and bearing a secondary penicillus; penicil- 

 lus 2 to 3 times verticillate, usually symmetrically, occasionally with a superposed 

 verticil on the main stalk prolonged; branches in the primary verticil (metulae?) up 

 to 12 or more in number 8.4 to 11.2 by 3.2 to 5.6/i bearing either a secondary verticil 

 of shorter and smaller metulae or sterigmata 4 to 6 in the verticil 8.4 to 11.2;u in length 

 with long tapering points bearing the conidia; conidia ovoid, averaging 3.2 by 2.8^; 

 sclerotia and perithecia not reported." 



Thom's notes on a culture (his No. 4725.1021, now lost from the Collec- 

 tion) from C. G. Hansford in Jamaica, which produced conidial structures 

 with the characters of P. olsoni, follow: 



"Colonies in Czapek's solution agar spreading broadly in its conidial stage, bluish 

 green, loosely velvety, forming a mass of loosely standing stalks up to 2 mm. deep, 

 with rather thin margin, later with the development of an overgrowth of ropes and 

 tufts and masses of hyphae with sporadically at least the development of sclerotia or 

 perithecia, black, more or less submerged, brittle but so far as studied producing no 

 asci; reverse pale yellow to red or reddish in areas; conidiophores long, coarse, 500 to 

 1000 or even 2000;u by 8m unbranched, colorless, smooth; penicillus biverticillate, or in 

 some triverticillate, consisting of a crowded verticil of diverging metulae about 10 to 

 12m in length, and much smaller in diameter than the stalk, bearing the sterigmata or 

 occasionally with secondary verticils of shorter cells 8 to 10m long, bearing the sterig- 

 mata; sterigmata up to 10m long, niore or less long pointed; conidia elliptical to almost 

 globose 3 to 3.5m in long axis smooth or with faint traces of granulation or spinulosity 

 in the walls." 



* Refers to Klincksieck and Valette, Code des Coleurs, 1908 (Paris). 



