. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 38 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. Colonies liquefy gelatin, but slowly and incompletely, and give a neutral or acid reaction upon all litmus media. Under different conditions of culture and acidity the discoloration of the medium varies from yellow to orange and deep red. Produces dis- colorations upon commercial timbers. Habitat, pine wood, which is strongly colored by it. Culture received from the author, G. G. Hedgcock, of the Forest Pathological Lab- or
. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 38 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. Colonies liquefy gelatin, but slowly and incompletely, and give a neutral or acid reaction upon all litmus media. Under different conditions of culture and acidity the discoloration of the medium varies from yellow to orange and deep red. Produces dis- colorations upon commercial timbers. Habitat, pine wood, which is strongly colored by it. Culture received from the author, G. G. Hedgcock, of the Forest Pathological Lab- oratory, Bureau of Plant Industry, United States Department of Agriculture. Since the publication of his description of this fungus (1906) Hedg- cock9 has reached the conclusion, concurred in by the writer, that this species can not be regarded as identical with the species described by Corda as P. aureum. He notes that this species is a common agent in the discoloration of pine wood, hence proposes the name P. pino- fliilum (here first published). Careful consideration of Corda's figure and description would establish a strong presumption that. Fig. 6.—Penicillium pinophilum Hedgcock: a, young conidial fructification showing conidiiferous cells at apex of central branch before all the branches appear (X 1,600); 6, a verticil of four branches, upon one of which fruit appears (X 1,600); c, d, conidiiferous cells and conidia (X 1,600); c, rope of hyphse bearing conidiophores sketched (X 140); /, g, forms of conidial fructification (X 140). the form described by him would not now be considered a species of Penicillium. CULTURAL DATA. Color, conidial areas green, vegetative mycelium colorless or studded with yellow granules; reverse of colony red; color in media, red. Odor, none. Fifteen per cent gelatin in water, growth slow, surface growth of conidiophores and green conidial fructifications only; liquefaction, none or very slow (in acidified cultures only after several weeks); li
Size: 1558px × 1604px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
