Fungi, Ascomycetes, Ustilaginales, Uredinales . rther investigation, especially from thispoint of view. In both Xylaria and Hypoxylon the young stroma is covered by a tangle 170 PYRENOMYCETES [CH. of conidiophores, from which small oval conidia are abstricted. In Xylariathese form a white coating, in marked contrast to the older black portionsof the stroma, where the perithecia are maturing, and justify the namecandle-snuff fungus, applied to some of the commoner species. If, in eithergenus, the stroma be sectioned during the conidial stage, nests of smallhyphae, similar to those in Poronia, w
Fungi, Ascomycetes, Ustilaginales, Uredinales . rther investigation, especially from thispoint of view. In both Xylaria and Hypoxylon the young stroma is covered by a tangle 170 PYRENOMYCETES [CH. of conidiophores, from which small oval conidia are abstricted. In Xylariathese form a white coating, in marked contrast to the older black portionsof the stroma, where the perithecia are maturing, and justify the namecandle-snuff fungus, applied to some of the commoner species. If, in eithergenus, the stroma be sectioned during the conidial stage, nests of smallhyphae, similar to those in Poronia, will be found, and are the first indica-tions of the perithecia. Sometimes a stouter hypha with larger nuclei, presumably an archicarp,is recognizable (fig. 12S), but it has not been shown to function, and thereis no evidence of normal sexuality. It is however not unlikely that someof these species, which are conveniently easy to microtome, will repayfurther investigation. At a later stage ascogenous hyphae are readily recog-nizable (fig. 129).. Fig. 128. Xylaria polymorph/* (Pers.)Grev.; archicarp embedded instroma, x iooo.
Size: 1154px × 2166px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
