A text-book of mycology and plant pathology . asstores of reserve material. These are some of the principal forms ofthe vegetative thallus of the fungi. Further details will be given inhe discussion which follows. Some sudden epidemics of rust fungi CHARACTERISTICS OF THE TRUE FUNGI 49 have been ascribed by Eriksson to the presence of the protoplasm ofthe rust mixed with the protoplasm of the host. To this includedfungous protoplasm he gave the name mycoplasm. Some fungi are symbiotic, that is, they are found in intimate re-lation with chlorophyll-containing plants and obtain from them foodof
A text-book of mycology and plant pathology . asstores of reserve material. These are some of the principal forms ofthe vegetative thallus of the fungi. Further details will be given inhe discussion which follows. Some sudden epidemics of rust fungi CHARACTERISTICS OF THE TRUE FUNGI 49 have been ascribed by Eriksson to the presence of the protoplasm ofthe rust mixed with the protoplasm of the host. To this includedfungous protoplasm he gave the name mycoplasm. Some fungi are symbiotic, that is, they are found in intimate re-lation with chlorophyll-containing plants and obtain from them foodof a carbonaceous character, but without apparently injuring thegreen symbiont. When they live with algae, they commonly formlichens; or if in connection with the roots of trees, orchids; and inprothallia they form what is known as mycorhiza (Fig. i6). The spores or reproductive cells of fungi may be of two kinds:non-sexual spores and sexual spores. The non-sexual spores are cellswhich are formed vegetatively. They are cells which take special. Fig. i6.—Ectotrophic mycorhizas. At left hyphal mantle on root of hickoryCarya ovata in cross section; at right root tip of an oak, Quercus, with fungous mantle.{From Gager, after W. B. McDougall.) forms in the different groups of fungi and are produced as special cells,in a purely vegetative manner. They represent a special part of thethallus given over, to reproduction. Upon the formation of thesespores, which may germinate at once or live for some time as restingspores, the rapid multiphcation of the fungi depends. It is the innu-merable quantity of these non-sexual spores upon which an epidemicof some particular fungous disease may depend. Only the most generalcharacters of the various kinds of spores can be discussed in an intro-duction of this kind. The special kinds will receive due attention aswe proceed. Spores which are cut off, or pinched off, in concatenationfrom the end of a vertical hypha, are known as conidiospores. In ther
Size: 1344px × 1860px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidtextbook, booksubjectfungi
