. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 76. Ascobolusfurfuraceus Pers.; a. young archicarp, x 750; b. rather older specimen showing pores between the cells, x 625 ; after Welsford. fourth from the apex (Welsford), enlarges, buds out ascogenous hyphae and functions as the oogonium. Those near the base form a stalk, and those towards the apex may be regarded as constituting a now functionless trichogyne. The cells on each side of the oogonium communicate with it by means of pores (fig. 76 U). Additional nuclei pass into it from both the stalk and terminal cells, and Welsford
. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Fig. 76. Ascobolusfurfuraceus Pers.; a. young archicarp, x 750; b. rather older specimen showing pores between the cells, x 625 ; after Welsford. fourth from the apex (Welsford), enlarges, buds out ascogenous hyphae and functions as the oogonium. Those near the base form a stalk, and those towards the apex may be regarded as constituting a now functionless trichogyne. The cells on each side of the oogonium communicate with it by means of pores (fig. 76 U). Additional nuclei pass into it from both the stalk and terminal cells, and Welsford has observed their fusion in pairs in the oogonium. The fusion nuclei pass into the ascogenous hyphae. The asci are large and produce each eight spores which are violet or brownish in colour; the epispore is characteristically sculptured at maturity. There are eight chromosomes in the first division in the ascus, and four in the second and third (Dangeard (fig. 13), Fraser and Brooks). In Ascobolus glaber the archicarp is larger and more twisted than in A. furfuraceiis, and consists of some twenty or thirty cells from one or more of which the ascogenous hyphae develop (Dangeard). In Ascobolus Winteri, a form occur- ring on goose dung, and apparently limited to this habitat, the archicarp (fig. jjX as described by Dodge, con- sists of three parts, a stalk of two or three cells, a series of larger, central cells, which give rise to the ascogenous hyphae, and a terminal row of three. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gwynne-Vaughan, Helen Charlotte Isabella (Fraser) Dame, 1879-. Cambridge [Eng] University Press
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
