Introduction to the study of fungi : their organography, classification and distribution, for the use of collectors / by M.C. Cooke.

Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Introduction to the study of fungi : their organography, classification and distribution, for the use of collectors / by M.C. Cooke. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    absent in a few genera. In one group only, the Lophiostomaceae, the mouth is broad and compressed. The fructification there- fore is always enclosed, as it is in the case of a peridium, but this is their only point of agreement. Whatever the form of the carpophore, the perithecia are always crowded together on the upper portion, and even when the carpophore is globose it is flattened at the base, and as the perithecia approach the base they are smaller, less numerous, and often imperfect. ^ As already stated, the perithecia are always peripherical, and in a single series; but if, in rare cases, there is a second series, the necks of the perithecia are elongated so as to reach the surface of the stroma. When a great number of perithecia are collected together, and immersed in the matrix, a kind of stroma is formed from the matrix, as in Eutypa; but when on the surface, a regular stroma is formed upon the mycelium, which is fleshy in Hypocrea and carbonaceous in Eypoxylon, and the perithecia are closely packed and immersed in the stroma, which is per- forated by the ostiola. The densely aggregated perithecia may sometimes be fused together so as to resemble an effused stroma. There are some genera in which the perithecia seem to be obsolete, or only formed from the stroma, in which the perithecia appear only as cells, as in Phyllacliora ; but the walls of the perithecia are possibly fused with the stroma and not wholly absent. The character of the fructification may be entirely f^g. 21.-Receptacle of sporo- different, while that of the perithecia mega in Hysteriaceae, with remains the same. The same peri- ^^'^^^ thecium, to all external appearances, may belong either to the Pyrenomycctes or the Sphaeropsideae. It may be a Diplodia or a Plaeospora. It may be necessary to refer incidentally to a modification which is almost intermediate between an excipulum and a peri- thecium, which is prevalent in the comparatively small family, the Hysteriaceae. Here the excipulum closes from two opposite sides, leaving a slit down the centre. When well moistened