THE SPECIES OF THE GENUS PENICILLIUM. 345 



The species, with its unbranched conidiophores, moreover, belongs 

 to the genus Citromyces. 



Penicillium humicola, Oudemans, is yellow-green. The conidio- 

 phores measure about 110-120 by 1-1.5 P- (probably a typo- 

 graphical error ?), and are branched in whorls. The conidia are 

 2 fj, in diameter. Oudemans' diagrammatic drawing exhibits no 

 special features. 



Penicillium desciscens, Oudemans, is similar to the preceding 

 species. The conidiophores show repeated branchings. The 

 description gives the diameter of the conidia as 2-3 JJL, but, 

 according to the drawing, they are ellipsoidal (P. luteum ?). 



Penicillium silvaticum, Oudemans, is brown. The conidio- 

 phores measure 210 by 2-3.5 A*> anc ^ are septated, with a whorl of 

 bottle-shaped sterigmata, from which separate the pale brown, 

 spherical conidia, 2-3 JJL in diameter. The unbranched conidio- 

 phore excludes this species from the Penicillium group. It is 

 apparently identical with P. geophilum, and should be classed with 

 Citromyces. 



Penicillium candidum. Link, forms white herbages, the 

 conidiophores and conidia apparently coinciding with those of 

 "P. glaucum." The spherical conidia measure 2-3 JJL in diameter. 

 The species grows on all kinds of vegetables. Accurate reports 

 are lacking, but MORINI (I.) speaks of sclerotia and asci, the latter 

 being ovoid, 24-30 JJL long, and containing eight smooth ovoid 

 spores measuring 6.5-9 by 3.5-5 p. 



According to ROGER (I.) a white Penicillium termed P. candi- 

 dum, but not fully described plays a part in the ripening of 

 Brie cheese, which it covers with a pale herbage. EPSTEIN (I.), 

 who also discovered this fungus, named it P. album, but its 

 identity with the older P. album, Preuss (1851), has not been 

 established ; and it is also doubtful whether it coincides with the 

 above-mentioned P. candidwn, Link. More probably it is the 

 same as P. Camembert, which is slightly green at first, afterwards 

 turning greyish white. 



Penicillium Duclauxii, Delacroix, forms herbages, which are 

 white or sulphur-yellow at first, afterwards turning olive-green. 

 The sterigmata are spindle-shaped, the conidia rounded-ellipsoidal, 

 and measuring 3-4 ^t in diameter. The species has been found 

 on grapes that have lain in water. According to the description 

 by Delacroix, the species is probably P. luteum. 



Penicillium insigne (Winter), Schroter, forms white conidial 

 herbages and elongated ellipsoidal conidia. The structure of 

 the conidiophores closely resembles that of P. luteum. It was 

 described by WINTER (IV.) as Eurotium insigne, and, according 

 to SCIIROTER (I.), is identical with Gliocladium penicilloides, Corda. 

 The pale yellowish brown, globular perithecia (0.25-1 mm. in 

 diameter) have a smooth, thin, pseudo-parenchymatic skin. The 

 asci are elongated ellipsoids (35-50-28-35 p), and contain eight 



