594 A MANUAL OF THE PENICILLIA 



The species is believed to be more closely related to Penicillium wort- 

 manni than to other members of the P. luteum series. It differs from P. 

 wortmanni principally in the character of its perithecial initials and its 

 globose ascospores. In form, the latter are similar to the spores of P. hacil- 

 losporimi Swift but are consistently larger. It is readily distinguished 

 from the latter species by differences in habits of growth, coloration, and 

 particularly conidial patterns. 



Penicillium hacillosporum Sw^ft, in Bui. Torrey Botanical Club 59: 221- 



227, fig. 1, a to g. 1932. Emmons, Mycologia 27: 136, 



figs. 2 and 16. 1935. 



S■v^dft's diagnosis as follows: 



"Mycelium funiculose showing marked color differences on different nutrients, 

 from pale yellow on cornmeal to salmon on dextrose agar. Chromogenic effects in the 

 medium itself also varied from bright green in cornmeal agar to red in dextrose agar. 



"Conidia 3-6 x 1.5yu, bacillar, not numerous, in long diverging thread-like chains, 

 persistent at first, fragmenting in age. Penicillus predominantly monoverticillate, 

 but occasionally biverticillate. Sterigmata 10-15 x 2.5-3.5^, five or six in a whorl. 

 Conidiophores short, 25-50 x 3-5/i, branched, formed mostly at right angles to the 

 trailing, sometimes funiculose, hyphae. 



"Perithecia averaging 137-150m in diameter, usually whitish to pale yellow, with 

 thin but definite walls of interlacing hyphae. Asci 10-12.5 x 7.5-10;u, globose, oval 

 or pear-shaped, 8-spored. Ascospores 3.5-4;u, globose, finely verrucose, hyaline to 

 yellowish in age. 



"On Begonia leaf, probably saprophytic. 



"Type locality. New York City." 



Additional notes based upon Swift's original species description and upon 

 our observations of the type culture: 



Colonies on Czapek's solution agar growing somewhat restrictedly, con- 

 sisting of a velvety aerial felt more or less buckled, pale yellow throughout, 

 often developing a slight green tinge at extreme center, later becoming 

 sulphur yellow in the center with pale yellow to orange droplets; reverse 

 at first dark and indefinite, later becoming green at colony edge. Both 

 perithecia and conidial structures produced but often in limited numbers. 



Colonies on malt extract agar spreading, about 5 cm. in diam3ter in 

 2 weeks at room temperature, plane, fairly thin, consisting of a fairly loose 

 aerial felt of somewhat funiculose hyphae in which are embedded abundant 

 perithecia near the agar surface and upon which are borne scattered to 

 fairly numerous conidial structures, mostly monoverticillate, occasionally 

 biverticillate and symmetrical. 



Colonies on cornmeal agar spreading, showing little aerial growth except 

 around the very pale yellowish perithecia which dot the surface of the colony 

 after a few days; mycelium almost entirely submerged and hyaline; reverse 



