Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 108. Polystigma rubriim DC; young perithe-cium; the ascogenous hyphae are not yet clearlydistinguished, many of the nuclei are in pairs, thedarkly stained remains of ihe archicap are visiblenear the periphery; x68o; after Blackman Fig. 109. Polystigma rtibrutn DC ; matuthecium, x 270; after Blackman and W re pen-elsford. 1 Nienburg, p. 390, end of first paragraph. v] IIYIOt RKALKS 149 authors found some evidence that a first nuclear fusion takes place in theascogenous hypha before the differentiation of the asci. The ascus is f
Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 108. Polystigma rubriim DC; young perithe-cium; the ascogenous hyphae are not yet clearlydistinguished, many of the nuclei are in pairs, thedarkly stained remains of ihe archicap are visiblenear the periphery; x68o; after Blackman Fig. 109. Polystigma rtibrutn DC ; matuthecium, x 270; after Blackman and W re pen-elsford. 1 Nienburg, p. 390, end of first paragraph. v] IIYIOt RKALKS 149 authors found some evidence that a first nuclear fusion takes place in theascogenous hypha before the differentiation of the asci. The ascus is formed in the usual way from the penultimate cell of thehypha; the usual nuclear fusion and successive nuclear divisions take placeduring its development. In the genus Podocrea, the stroma is erect, and sometimes branched; inHypocrea it is usually hemispherical or bolster-shaped and is colourless, oryellow or brown in colour. The majority of species occur saprophyticallvon wood, or as parasites on the larger fungi. In both genera and intheir immediate allies, the spores are two or more celled. The systematicposition of Podocrea alutacea} has undergone curious vicissitudes; in con-sideration of its form it was at first placed among the Basidiomycetes asClavaria simplex, later it was regarde
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
