Fungi, Ascomycetes, Ustilaginales, Uredinales . LF, F. A. Spore Formation in Podospora anserina, (Rabh.J Wint. Ann. Myc.x, p. 60. Sphaeriaceae The perithecia of the Sphaeriaceae are superficial, and are borne singlyor in groups; the peridium may be smooth or beset with hairs or spines.The papillate ostiole distinguishes this family from the succeeding formswith free perithecia. The majority are saprophytic on plant remains, frequently on wood; some are parasites, such as the speciesof Coleroa (fig. 118), which occur on theleaves of Potentilla, Rubtis, and otherflowering plants. Rosellina querc
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Fungi, Ascomycetes, Ustilaginales, Uredinales . LF, F. A. Spore Formation in Podospora anserina, (Rabh.J Wint. Ann. Myc.x, p. 60. Sphaeriaceae The perithecia of the Sphaeriaceae are superficial, and are borne singlyor in groups; the peridium may be smooth or beset with hairs or spines.The papillate ostiole distinguishes this family from the succeeding formswith free perithecia. The majority are saprophytic on plant remains, frequently on wood; some are parasites, such as the speciesof Coleroa (fig. 118), which occur on theleaves of Potentilla, Rubtis, and otherflowering plants. Rosellina quercina, the oak root fun-gus, attacks the roots of oak seedlings;the hyphae enter the living cells of thecortex and pith; they are at first hyaline, later dark in colour, and become twistedtogether into strands, the so-called rhi-zoctonia; these attack the roots of neigh-bouring oak plants, wrap a weft of hyphaeabout them and enter their cells. The Fig. 118. Coleroa Potenlillae (rr.) Wint.; perithecia, x 192. fungus may form black, chambered scle-. v] SPHAERIALES i59 rotia which originate in the cortex of the host root; reproduction is bymeans ot conidia formed in summer on the surface of the soil, and furtherby ascospores produced in perithecia, I [artig has found that the perithecium is initiated by the development of a pair of thick hyphae rich in contents.These become enclosed within a mass of vegetative tissue, but their subse-quent behaviour lias not been determined, and no details of developmentare known either here or in other members of the family. SPHAERIACEAE: BIBLIOGRAPHY • HARTIG, R. Der Eichenwurzeltodter Rosellina quercina. Untersuch. aus der forst-botanische Inst, zu Miinchen iii, p. 1. Ceratostomataceae The Ceratostomataceae resemble the Sphaeriaceae in most of theircharacters: they are distinguished by the elongated neck of the perithecium, which is often drawn out to form a delicate hair-like process. The methodof liberation of the spores in this family presents