. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 190 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. the special literature. The most important and most general phenomenon of intetcalary growth in the surface of the hymenium consists in the introduction of new asci already mentioned, which goes on for a long time at all points. This is the cause of the long continued superficial growth of many hymenia. Some smaller disk-shaped apothecia, those for example of Ascobohis and Fyro- nema, show no marginal progressive growth
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 190 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. the special literature. The most important and most general phenomenon of intetcalary growth in the surface of the hymenium consists in the introduction of new asci already mentioned, which goes on for a long time at all points. This is the cause of the long continued superficial growth of many hymenia. Some smaller disk-shaped apothecia, those for example of Ascobohis and Fyro- nema, show no marginal progressive growth or only a trace of it. In this respect and in some others also their development approaches that of the 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. 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 not perfectly resemble the original Bary, A. de (Anton), 1831-1888; Garnse
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