70 



CULTURAL STUDIES OF SPECIES OF PENICILLIUM. 



Cultivated in gelatin or potato or bean agar, deep green, broadly spreading, surface 

 closely floccose with procumbent hyphse, tufts and ropes of hyphse bearing lateral 

 conidiophores; reverse becoming red, purple, or very dark purple, almost black, with 

 the whole mass of medium colored; conidiphores short, 20-80 or lOO/i, mostly perpen- 

 dicular branches from trailing hyphae, sometimes arising separately from the sub- 

 stratum; conidial fructification up to 125 or 160/t in length, with 1 or 2 alternate 

 appressed branches bearing verticillate branchlets and dense verticils of parallel coni- 

 diiferous cells 10-14 by 2-3/z; conidia at first cylindrical, then elliptical or fusiform, 

 3-4 by 2-3jn, green, in chains which break up completely in fluid mounts; colonies 

 not liquefying gelatin in 2 weeks, with acid reaction to litmus. 



Fig. 27. — Penicillium funiculosum: a, b, c, d, c,f, conidial fructifications with conidiiferous cells and conidia 

 (X 900, except e, 1,600); g, h,j, k, I, m, n, sketches of fructifications, separate and borne upon hyphse 

 and ropes of hyphse (x 140). o, r, germination of conidia (X 900). 



Found in accidental culture, Storrs, Conn., 1905; also received from Dr. E. A. 

 Bessey, Miami, Fla., 1908. Easily recognized in culture. 



CULTURAL DATA. 



Color, deep green with secondary floccose masses of mycelium in some cultures; 

 reverse and color in media, red to very dark red, or, colorless in certain media. 



Odor, none. 



Fifteen per cent gelatin in water, thin, widespread but characteristic growth; lique- 

 faction, none or very slight; litmus reaction acid. Potato agar and bean agar, typical 



