. Comparative morphology of Fungi. Fungi. 434 COMPARATIVE MORPHOLOGY OF FUNGI Brachybasidium is very interesting from the viewpoint of comparative morphology; for there can be no doubt that this thick-walled probasidium affords protection and makes it possible for the basidium to await favor- able conditions for germination. In this sense, it is comparable to the sclerobasidia of the Phragmobasidiomycetes. The chiastobasidial Auto- basidiomycetes have attained the same degree of development in this family as the stichobasidial Phragmobasidiomycetes in the Septobasidia- ceae, and the lepto-form
. Comparative morphology of Fungi. Fungi. 434 COMPARATIVE MORPHOLOGY OF FUNGI Brachybasidium is very interesting from the viewpoint of comparative morphology; for there can be no doubt that this thick-walled probasidium affords protection and makes it possible for the basidium to await favor- able conditions for germination. In this sense, it is comparable to the sclerobasidia of the Phragmobasidiomycetes. The chiastobasidial Auto- basidiomycetes have attained the same degree of development in this family as the stichobasidial Phragmobasidiomycetes in the Septobasidia- ceae, and the lepto-forms of the Uredinales. Corticiaceae.—This family includes the simplest forms of the Poly- porales; they show beginnings of the various directions of development and form thereby, as is shown in the scheme on page 430, the key to the. Fig. 276.—Brachybasidium Pinangae. Section of zeugite sorus with three germinating zeugites. ( X 390; after Gaumann, 1922.) whole order. Their representatives are mostly saprophytes on earth, wood or dead parts of plants. Their basidia are generally four, more seldom two, or six to eight spored. Usually their spores are hyaline and smooth, rarely, as in Hypochnus (Tomentella), rough and brown or yellow. According to the structure of their fructifications, they may be divided into three intergrading stages of development. The forms of the lowest stage, as Tulasnella of the Tulasnelaceae, Helicobasidium of the Auriculariales and Sebacina of the Tremellales, spread out on the sub- strate in an arachnoid covering; the basidia rise, like free conidiophores, at unequal heights on the same hyphae, singly or in candelabra (Fig. 265, 1); thus there are formed no, or only diffuse, fructifications and hymenia. In the second stage, the hyphae intertwine to homogeneous, leathery or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may n
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