344 MORPHOLOGY OF THE ASPERGILLACE^. 



and the pigment differs from that of the preceding species. No 

 fructification bodies have been discovered. Particulars of its 

 behaviour in cultures, as compared with the two preceding species, 

 are given by STOLL (I.). 



Penicillium bicolor, Fries, is a species described by OUDEMANS 

 (IV.) as having been isolated from soil; and, unless found to be 

 identical with some other species, should probably be re-named. 

 It forms greyish green coatings or cushions, with a sulphur- 

 coloured rim (similar to P. luteum), but the conidia are spherical 

 (2.3 p. in diameter). The conidiophores are divided up into two 

 or three groups of fours, with cylindrical, pointed sterigmata and 

 long conidial chains. It is probably difficult now to say what 

 species was actually examined by Fries, though the yellow periphery 

 of the cushions distinguishes it from "P. glaucum" 



Penicillium claviforme, BAINIER, was observed by that worker 

 (I.) in 1905, on powdered oak bark at a drug store. The species 

 is rendered so remarkable from the formation of club-shaped 

 growths (1-2 cm. in height), which are white at first, but after- 

 wards green, resembling those of Isaria, and also occurring 

 extensively in pure cultures, that is not easily confounded with 

 any other kind. The conidia measure 4.2 by 3.1 ^i, and are of a 

 pure colour. The species should probably be classed with Isaria. 



Penicillium granulatum, Bainier. was observed on oak chips in 

 the woods. It produces a yellow pigment. The conidia are 

 globular to ellipsoidal, measuring 2.6 by 2.1 p. This species, like 

 the preceding one, was cultivated by BAINIER (I.). 



The following species need more accurate description, and are 

 probably to some extent synonymous or doubtful. 



Penicillium roseuin, Link, forms reddish growths on vegetables. 

 According to OUDEMANS (I,) the conidia measure 5-6 by 2-2.3 /* 

 The species is apparently rare, and also requires further investi- 

 gation. 



Penicillium radiatum, P. Lindner, differs from the other 

 species by its tough-walled, dark-coloured conidiophores. The 

 conidia are green and spherical. This species was found on cran- 

 berries by P. LINDNER (XXXIII. ), on which habitat it forms 

 black, spherical sclerotia. Further investigation is needed for 

 more complete particulars. 



OUDEMANS (II.) has recently found (in 1902) several species in 

 forest humus. These, however, can only be briefly mentioned, 

 more complete investigation being necessary ; from the description 

 and drawings given, it is doubtful whether they really constitute 

 new species. 



Penicillium geophilum, Oudernans, produces conidiophores 

 about 360 JJL high and 6 // thick, which are septated and provided 

 with a whorl of bottle-shaped twigs (sterigmata), up to 30 jj, in 

 length, from which the conidia separate direct by abstriction. 

 The conidia are spherical, green in colour, arid 34 ^ in diameter. 



