. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. 290 DIVISION — COURSE OF DEVELOPMENT OF FUNGI. adopted. The veil is rent by the upward extension of the pileus, and often, but not always, in such a manner that a portion of it remains behind on the stipe as an annular frill [ring or annulus). The veil appears in two principal forms; first, as a membrane running from the margin of the pileus to the surface of the stipe, and therefore does not enclose much more than the hymenia] surfaces, but leaves all the other part free
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. 290 DIVISION — COURSE OF DEVELOPMENT OF FUNGI. adopted. The veil is rent by the upward extension of the pileus, and often, but not always, in such a manner that a portion of it remains behind on the stipe as an annular frill [ring or annulus). The veil appears in two principal forms; first, as a membrane running from the margin of the pileus to the surface of the stipe, and therefore does not enclose much more than the hymenia] surfaces, but leaves all the other part free; in this case it may be called a marginal veil, or with Fries velum particle (Fig. 132). Secondly, as a sac which encloses the entire sporophore from its base, and is ruptured at the apex by the unfolding pileus; in this state it is the velum universale or volva (see below, Fig. 135). 1. As regards the development of the forms which have the marginal veil only the following special facts have been established by observation. Up to the first formation of the pileus on the summit of the stipe-primordium the phenomena are the same in essential points as in the gymnocarpous forms (Fig. 24 a). The young pileus is entirely delimited from the stipe by a transverse annular furrow running along its future hymenial surface. But then the superficial hyphal layers of the stipe and of the young pileus send out numerous branches towards one another from the edges of the furrow; these unite into a close weft, the marginal veil, which bridges over the furrow and closes it on the outside (Fig. 133). The body of the pileus then developes from the inner hyphal layers of the primordium, those which are nearest the furrow, and chiefly by uniform growth in the direction of the margin and by alternate epinastic and hyponastic growth, as in the species which have no veil. The veil, together with the portion of the stipe in- closed by it, follows the superficial increase in size of the pileus by int
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