. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. IV] PEZIZALES 121 multicellular archicarps, each rather like the single scolecite of Ascobolus. The cells are not connected by pores, and ascogenous hyphae arise from several in each archicarp. In R. brunneiis Dangeard reports a single archicarp, consisting of a short, somewhat twisted branch. Ramlow has also recorded a single archicarp in R. polysporus and Barker in an unnamed species. Overton has made some study of the development of the numerous spores in R. Pelletieri. The ascus nucleus divides as usual to form eight free nuclei, thes
. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. IV] PEZIZALES 121 multicellular archicarps, each rather like the single scolecite of Ascobolus. The cells are not connected by pores, and ascogenous hyphae arise from several in each archicarp. In R. brunneiis Dangeard reports a single archicarp, consisting of a short, somewhat twisted branch. Ramlow has also recorded a single archicarp in R. polysporus and Barker in an unnamed species. Overton has made some study of the development of the numerous spores in R. Pelletieri. The ascus nucleus divides as usual to form eight free nuclei, these undergo a period of rest and growth and then divide further till thirty-two free nuclei are formed. Around these the spores are delimited in the usual way. Thelebolus stercoreus has a mycelium of uninucleate cells, from one of which the archicarp arises as a thick branch containing a single nucleus. Later two, four, and finally eight, are seen (fig. 85), and then septation takes. Fig. 84. Thelebolus stercoreus Tde.; a. young ascocarp with binucleate, asci; containing fusion nucleus, both x8io; after Ramlow. b. ascus place, so that a row of cells is formed. Most of these are uninucleate, but one contains two nuclei (fig. 8412); it enlarges and becomes the single ascus; in it the two nuclei fuse (fig. 84^). The definitive nucleus divides karyo- kinetically, sometimes as many as ten times, so that 1042 nuclei are 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 Gwynne-Vaughan, Helen Charlotte Isabella (Fraser) Dame, 1879-. Cambridge [Eng] University Press
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
