122 A MANUAL OP THE PENICILLIA 



tional manner, is more detailed, and should enable the worker to determine 

 the probable series relationships of the form under observation, or at least 

 to narrow the possibilities down to two or three such series. Further steps 

 toward identification are made by means of the keys to individual series, 

 or to sections and sub-sections when questions arise regarding the correct- 

 ness of presumptive series assignment. 



Page 



General Key to Series 

 I. Penicilli consisting of single clusters, or verticils of sterigmata at the tips of 

 fertile hyphae, or conidiophores; conidiophores usually unbranched, in 

 some forms irregularly branched but with each branch terminating in a 

 distinct and separate monoverticillate penicillus 



MoNOVERTiciLLATA Section 126 



A. Colonies producing either perithecia or sclerotia. 



1. Colonies producing fertile perithecia which are commonly sclerotioid 



and often ripen late P. javanicum series 132 



2. Colonies producing sclerotia, often suggestive of young perithecia 



but never developing an ascogenous stage P. thomii series 154 



B. Colonies producing neither perithecia nor sclerotia. 



1. Conidiophores generally unbranched and bearing single, strictly 



monoverticillate penicilli. 



a. Colonies velvety or nearly so; conidiophores arising mostly from 



the substratum. 

 1'. Colonies generally spreading broadly. 



aa. Conidia globose or subglobose P. frequentans series 170 



bb. Conidia elliptical P. lividum series 189 



2'. Colonies growing rather restrictedly, especially on Czapek's 



solution agar P. implicatum series 196 



b. Colonies appearing velvety or lightly fioccose, but with conidio- 



phores borne as short branches from interwoven aerial hyphae 



P. decumbens series 205 



c. Colonies fioccose or floccose-funiculose with conidiophores arising 



primarily from aerial hyphae. 

 1'. Colonies predominantly fioccose with funiculose habit lacking 



or limited P. restrictum series 222 



2'. Colonies with funiculose habit predominant or well-developed 



P. adametzi series 227 



2. Conidiophores mostly irregularly branched but with each branch 



bearing a terminal, well-marked monoverticillate penicillus 



The Ramigena series 239 

 II. Penicilli characteristically once- or twice-branched below the level of the 

 sterigmata; typically asymmetrical, irregular, or one-sided; sterigmata 



not lanceolate Asymmetrica Section 254 



A. Penicilli characteristically strongly divaricate, with individual ele- 

 ments strongly divergent, often appearing monoverticillate but so 

 arranged as to produce the appearance of a single branched penicillus 



Divaricata Sub-section 255 

 1. Colonies producing perithecia, sclerotia, or masses of thick-walled 

 cells. 



