Fungous Flora of the Soil 



487 



cillatim ferentibus, vel interdum ramis primariis ramum secondaritim 

 ferentibus, turn ramis secondariis apice 2-5 basidia verticillatim ferenti- 

 bus; cum solum rami primarii apice verticillatim feruntur, uterque 2-5 

 basidia fert; ramis secundarius cylindricis, 10-15^ longitudine; basidiis 

 y-iijLt longitudine, lagenif ormis ; conidiis hyalinis, globosis, 2-3/i diam., 

 longe catenulatis. 



Hab. In humis, Ithaca, N. Y., Amer. bor. 



Penicillium humicola (Oud.) emend. Arch. Neerl. Sci. Nat. ser. 2, 7: 

 290. 1902. 



Colonies round, at first yellowish green in center, finally dark green, 

 surrounded by yellow margin, which fades into white. Reverse of colony 

 in media containing sugar, red; sterile hyphse branched, q q 

 septate, yellowish green, i-4/.t thick; conidiophores iio- 

 200A1 high, 1-3. 2/i thick, hyaline, septate, either 3 

 verticillate primary, 8-io/^-long, branches at tip, which 

 produce at their tips 3 secondary branches 5-1 3 m long, or 

 varying from this to 3 primary branches, the side branches 

 of which may produce 3 or 4 secondary branches, the 

 center sometimes being dichotomous, the dichotomous 

 branches produce at their tips 3 or 4 secondary branches, 

 secondary branches flask-shaped; conidia yellowish green, 

 globose, 2-4. 5AC in diameter, in short chains. 



This form varies from P. humicola in being larger in 

 form, with less regularity in conidial fructification, and 

 not having primary branches S-shaped or curved. 



Hab. Isolated constantly from Dunkirk clay loam 

 near College of Agriculture in plant-breeding grounds, 

 Cornell University, Ithaca, N. Y., by the writer. 



Penicillium expansum (Link) Thom, Cultural Studies 



of Species of Penicillium. U. S. Dept. Agr., Bur. Anim. 



Indus. Bui. 118: 2 "J -2g. fig. i. 1910. 



Syn. Coremium glaucum Link, Observations, 19. Icones 5, fig. ji 

 Floccaria glauca Grev., Scottish Flora, pi. 301, figs. 1-4. 

 Penicillium glaucum Link (in part), Spec. Plant. 6: 70. 1824. 

 Coremium vulgare Corda (in part), Prachtflora, 54. pi. 25, especially figs. 3, 



4, 17, 18, ig, 20, a7id 21. 

 Possibly Penicillium elongatum Dierckx. 



Colonies on gelatin and potato agar green, becoming gray-green and 

 slowly brown in several weeks (especially when exposed to light), floccose, 

 with concentric zones tufted with short, loose, coremium-like aggregations 

 of conidiophores, not over 1-2 mm. in height except in old cultures con- 

 taining sugar, broadly spreading, with broad white margin in growing 

 colonies. Reverse somewhat yellowish brown; conidiophores either very 

 short lateral branches of aerial hyphse, or very long (i mm. or more), 



Fig. 123. — 



Penicillium 

 humicola 

 (Oud.) emend. 

 Conidiophores 

 and conidial 

 fructification, 

 X 400 



1809. 



