. Introduction to the study of fungi; their organography, classification, and distribution, for the use of collectors. Fungi. RUST FUNGI—UREDINEAE 247 species in which only teleutospores are known, and these do not germinate for a long time after the foster-plant is dead; and the Lepto-pucciniae, in which also the species only possess teleutospores, but the sori are compact, and germination takes place at once and whilst the foster-plant is living. Of course, outside of all these groups there still remain a rather large number of species, of uncertain place, mostly with only the teleutospores
. Introduction to the study of fungi; their organography, classification, and distribution, for the use of collectors. Fungi. RUST FUNGI—UREDINEAE 247 species in which only teleutospores are known, and these do not germinate for a long time after the foster-plant is dead; and the Lepto-pucciniae, in which also the species only possess teleutospores, but the sori are compact, and germination takes place at once and whilst the foster-plant is living. Of course, outside of all these groups there still remain a rather large number of species, of uncertain place, mostly with only the teleutospores definitely known, but which it is suspected will ultimately find a place in some of the foregoing groups, when their life-history has been ascertained. Other Didymosporous genera are Uropyxis, which seems to be hardly generically distinct, in which the teleutospore is involved in a thick per- manent hyaline integument; and Diorchidium, which differs chiefly from Puccinia in the septum being vertical. Gymno- sporangium is most distinct in the teleutospores being agglut- inated together in, generally, large tremelloid masses, the teleutospores themselves being transversely uniseptate, or very rarely biseptate, nearly hyaline, with long, sometimes very long, pedicels. In Phragmosporae the teleutospores are three, or more, septate,.in one direction. In most genera they are destitute of a pseudoperidium, whilst in Phragmidium1 (Fig. 119) and Xenodochus the uredospores are solitary. The differences between these two genera are slight: in the former the teleutospores are cylindrical, the cells not readily break- ing up into joints; in the latter the cells are more numerous and moniliform, soon breaking up into the component cells. In two genera the uredospores are catenulate, of which Coleosporium is the most import- ant; in this genus the uredospores are associated in chains, and the teleutospores Pl°- H9-—Teleutospores ., , , m, °f Phragmidium. are three, or many, septate. The
Size: 1175px × 2126px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcookemcm, bookcentury1800, bookdecade1890, bookyear1895
