. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 246 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI, (6) Dense hymenia giving off gonidia by abscision on the free outer surface of compound sporophores. Examples of this kind are Claviceps (page 227), Epichloe, the Nectrieae before mentioned, Xylarieae (Fig. 103 A), Cucurbitaria macrospora (Fig. 117), and many others. The form of the separate gonidiophores which together constitute the hymenium, the special mode of abjunction of the gonidia, and the structure and form of
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 246 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI, (6) Dense hymenia giving off gonidia by abscision on the free outer surface of compound sporophores. Examples of this kind are Claviceps (page 227), Epichloe, the Nectrieae before mentioned, Xylarieae (Fig. 103 A), Cucurbitaria macrospora (Fig. 117), and many others. The form of the separate gonidiophores which together constitute the hymenium, the special mode of abjunction of the gonidia, and the structure and form of the gonidia themselves, all vary extremely according to the species. And again it depends on the species whether the formation of gonidia is entirely, or almost entirely, confined to these hymenia or to the stromata which bear them, as is the case in Nectria cinnabarina and the other genera last named, or whether gonidia-forming hyphae of like structure occur either united into hymenia or appearing singly on a filamentous mycelium as in the Hyphomycetes, as happens in Nectria Solani and Hypomyces Solani'. Whether we have always to do with gonidia in the cases which have been given as examples, especially in the Xylarieae, or sometimes also with non-germinating spermatia, is often uncertain and must be determined in each separate case. {c) Pycnidia: receptacles (conceptacles) of more or less similar character to those described in Pleospora, and producing gonidia which are known as pycnospores or pycnogonidia or more commonly as stylospores. They are wanting in many or most species of Ascomycetes, in all forms, for instance, mentioned under b and in most of those mentioned under a, and in almost all Lichen-fungi. They were said indeed to have been found by Lindsay in Bryopogon jubatus, Kbr., Imbricaria saxatiiis and L sinuosa, Kbr.; by Gibelli in' Verrucaria carpinea, Pers.,' Sagedia carpinea, Mass., S. Zizyphi, Mass., S. callopisma, Mass., S. Thuretii, Kbr., Pyrenula minuta,
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