Text-book of structural and physiological botany . ished from the Pyrenomycetes mainly by the hymenium being superficial. In the Clavariese, which are branched in a fruticose manner, it covers the surface of the branches ; in the Helvellese and Morchellese, on the contrary, the outer surface of the folded pileus ; while in Peziza it clothes the inner surface of the cup, which is sometimes stalked and sometimes sessile. The morel, Morchella esculenta (Fig. 408), is a well-known edible Fungus. ^ There are a number of Fungi, as,for instance, some moulds, which it isnot at piesent possible to clas
Text-book of structural and physiological botany . ished from the Pyrenomycetes mainly by the hymenium being superficial. In the Clavariese, which are branched in a fruticose manner, it covers the surface of the branches ; in the Helvellese and Morchellese, on the contrary, the outer surface of the folded pileus ; while in Peziza it clothes the inner surface of the cup, which is sometimes stalked and sometimes sessile. The morel, Morchella esculenta (Fig. 408), is a well-known edible Fungus. ^ There are a number of Fungi, as,for instance, some moulds, which it isnot at piesent possible to classify underthis system. They are probably onlyforms of other Fungi, the relationshipof which to other has yet to becertainly determined. THE ^1, A/r , J- • T, J Fig. 408.—The morel, Morchella 1 he Myxomycetes are distmguished \scnlenta (natural size). from all other plants by the fact of their cells being without a cell-wall during their vegetative period, and not combined into a tissue. It is only when their protoplasm. 1 [De Bary has published a series of elaborate investigations of theAscomycetes, leading to the conclusion, that, in at least one group, thePyrenomycetes, the ascospores are the result of a true process of impreg-nation, viz. the contact of the apex of a male organ, which he termed\.\iQ polli?todmm, with a femae organ, the carpogonium or most recent researches, however, of Cornu and Van Tieghemthrow the greatest doubt on the accuracy of De Barys conclusions,and, indeed, on the existence of any form of sexual reproduction in thehigher Fungi. —Ed. J 284 StriLCtii7al and Physiological Botany, comes to rest from unfavourable external conditions, or their growthhas ceased on the formation of fruit, that the protoplasm breaks upinto small cells provided v^ith a cell-v\^all, but not forming a truetissue. They live on decaying and putrefying vegetable its membraneless condition the protoplasm displays an extra
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