. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 3o8 DIVISION II.—COVRSE OF DEVELOPMENT OF FUNGI. Gastromycetes. Section LXXXIX. The Gastromycetes include the chief groups of the Hyme- nogastreae, Lyeoperdaceae, TTidularieae, and Fhalloideae; to these are joined a few smaller divisions composed partly of forms intermediate between them and partly of divergent genera and some small groups. The compound sporophores in these Fungi spring from a simple filamentous or from a compound mycelium (see page 2 2). They are for
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 3o8 DIVISION II.—COVRSE OF DEVELOPMENT OF FUNGI. Gastromycetes. Section LXXXIX. The Gastromycetes include the chief groups of the Hyme- nogastreae, Lyeoperdaceae, TTidularieae, and Fhalloideae; to these are joined a few smaller divisions composed partly of forms intermediate between them and partly of divergent genera and some small groups. The compound sporophores in these Fungi spring from a simple filamentous or from a compound mycelium (see page 2 2). They are for the most part large, often very large, bodies; Fig. 141 represents a beautifully small specimen of a small species. When forming their spores they are all, with the exception of Gautieria, a genus of the Hymenogastreae, receptacles or sacs entirely surrounded by a closed wall of dense texture, the peridium or uterus, and usually divided inside by plates of tissue springing from the peridium into chambers in which the hymenium and the spores are formed. Gautieria has no peridium; the chambers in the peripheiy lie on the free surface and are open to the outside. In all other forms the peridium varies in thickness according to the species and is often extremely thick; in many cases it is largely and peculiarly differentiated, partly into persistent, partly into temporary parts, as will be set out at greater length presently. It is a general occurrence in the course of this differentiation that the peridium becomes strongly, often very strongly, thick- ened at the base, though there are exceptions to this rule, as in Hysterangium and the Nidularieae. The thickened portion either projects outwards in the form of a stipe which bears the chambered portion, as in or it projects inwards forming a cushion, as in Hymenogaster, Rhizopogon, Geaster hygrometricus (Fig. 146), or as an elongated vertical central column, as in most species of Geaster (Vittadini), the Phalloideae (see pages 3
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