. Synopsis of the British Basidiomycetes ; a descriptive catalogue of the drawings and specimens in the Department of botany, British museum. r supports named sterigmata. In rare instances, however, thebasidium bears two spores or perhaps only one; in these cases thenormal number of four is sometimes reverted to in well-developedexamples. In some species of the Tremellinacece the spores areseptate, and in some Gasteromycetes six or even more spores areproduced on a basidium. The spores are usually smooth and simple or composed of onecell; they are sometimes echinulate or warted. The commonestf
. Synopsis of the British Basidiomycetes ; a descriptive catalogue of the drawings and specimens in the Department of botany, British museum. r supports named sterigmata. In rare instances, however, thebasidium bears two spores or perhaps only one; in these cases thenormal number of four is sometimes reverted to in well-developedexamples. In some species of the Tremellinacece the spores areseptate, and in some Gasteromycetes six or even more spores areproduced on a basidium. The spores are usually smooth and simple or composed of onecell; they are sometimes echinulate or warted. The commonestform is oval or round; a few are multangular. They are of micro-scopic size, varying from about 18/x to 3/x in length, and of variouscolours. The character of the basidium with its four naked spores is oneof great importance, as it separates the Basidiomycetes from theAscomycetes. In the latter the spores are borne usually in a seriesof eight, within microscopic transparent elongated colourless sacsnamed asci (fig. 4); the asci when ripe open at the apex and thespores escape. In an examination of the spore-bearing surface or hymenium of. Fig. 3.—Pleurotusostreatus Quel. A, basidium; B, sterigmac, spore. X 750. INTRODUCTION
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