. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 46 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. cells continuous with conidiophores 12-15 by 4/i tapering to slender sterigmata. Co- nidia somewhat pear-shaped, slightly tuberculate at apex, with broad base, by , in mass light brown to chocolate; at first smooth, then with thick tuberculate walls, viable for many months, germinating by a single tube from the thin center of the broad base into a bulbous enlargement from which mycelial hyphae about 2/t in di
. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. 46 CULTURAL STUDIES OF SPECIES OF PENICILLIUM. cells continuous with conidiophores 12-15 by 4/i tapering to slender sterigmata. Co- nidia somewhat pear-shaped, slightly tuberculate at apex, with broad base, by , in mass light brown to chocolate; at first smooth, then with thick tuberculate walls, viable for many months, germinating by a single tube from the thin center of the broad base into a bulbous enlargement from which mycelial hyphae about 2/t in diameter arise. Mycelium very thin walled, narrow cells of varying length. Colonies liquefy sugar gelatin and give a strong blue reaction in litmus media, but grow very tardily, if at all, in potato or bean agar. Grows very rapidly upon neutral or alkaline media, but very slowly or not at all in media acid to litmus. Digests milk. Refused to grow after repeated inoculation into sterilized apple. Spores which refused to germinate in the agar media used grew immediately when transferred to any of the gelatin media. Cosmopolitan, forms characteristic chocolate patches on Camembert cheese. Se- cured from numerous brands of cheese and common in the laboratories of this Fig. 12—Penicillium brevicaule Saceardo: a, conidiophores and simple conidial chains with spores still smooth (X 900); &,/, more complex conidial fructifications (X 900); c, two young conidial chains, show- ing thick walls of spores (X 1,400); d, c, conidia after becoming echinulate (X 1,400); g, h,j, sketches of forms and habit of conidial fructifications (X 140); g from an old cluture, sessile or almost so; h and j show trailing hyphae and a rope of hyphae with lateral conidiophores; k, germinated conidium where the old spore wall lies empty beside the growing cell (X 1,400). The author does not believe that this species is closely related to other species of this genus, but since it has been placed he
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1910
