. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. f" ^i FIG. 89. Lecauora subfiitca. Median section through a young apothecium, swollen up in ammonia, somewhat diagranunatically represented; h h hymenium, e excipulum from which spring the paraphyses represented by strokes run, ning vertically towards h. sh ascogenous hyphae givmg rise to the asci, r lind, 9n medullary layer of the thallus which forms a rim round the excipulum. The round bodies are the algal cells contained m the thallus. Magn. 190 tunes. This is
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. f" ^i FIG. 89. Lecauora subfiitca. Median section through a young apothecium, swollen up in ammonia, somewhat diagranunatically represented; h h hymenium, e excipulum from which spring the paraphyses represented by strokes run, ning vertically towards h. sh ascogenous hyphae givmg rise to the asci, r lind, 9n medullary layer of the thallus which forms a rim round the excipulum. The round bodies are the algal cells contained m the thallus. Magn. 190 tunes. This is the case in a still higher degree with the ascocarps of the Hysteri- neae and Fhacidiaceae, the structure and development of which have been but little examined. According to Hartig's account of Hypoderma macrosporum and H. nervisequum and my own imperfect observations on some species of Rhytisraa and Phacidium, the hymenia in these groups are formed in the interior of flat sclerotioid Fungus-bodies (xyloma, see p. 43), and become exposed at the time of maturity, when the layer of tissue over the surface of the hymenium separates from it. Fig. 90. Thetidium minututunt. A perithecium borne on the thallus: a group of Algae, m the part of the thallus in the substratum which has no Algae, p the perithecium in median section diagrammatically repre- sented and slightly magnified. B a group of Algae with hyphae wmding round them. After StahL Magn. 480 times. and tears asunder in the mode which has often been described in the accounts of the different genera. In this case there are at first only paraphyses present in the hymenia; the origin of the asci which are introduced between them has yet to be exactly ascertained. Section LXI. The perithecia of the Pyrenomycetes (Fig. 90, see also Fig. 44), may be described as cup-shaped discomycetous sporocarps with the margin. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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