. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 14^ DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. are several oospheres present the tubes often grow from one to another, and even form branches which grow up to and past different oospheres, and sometimes even pierce through the wall of the oogonium and pass outside it; but they always remain closed and die in the course of 1-2 days while the oospheres are maturing. The short tubes of Aphanomyces scaber are the only ones which I have examined which never showed this l
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 14^ DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. are several oospheres present the tubes often grow from one to another, and even form branches which grow up to and past different oospheres, and sometimes even pierce through the wall of the oogonium and pass outside it; but they always remain closed and die in the course of 1-2 days while the oospheres are maturing. The short tubes of Aphanomyces scaber are the only ones which I have examined which never showed this luxuriance of growth; they apply their apex firmly to the oosphere which in this species is solitary, and re- main in that position without change till "the oospheres ripen in 2-3 days' time. These facts show that the antheridia and fertilisation - tubes of the Saprolegnieae must be considered to be homologous with those of Pythium and that they may be called by the same name: but there is no ground for regarding them as really fer- tilising organs; for while in some species, as Achlya polyandra and Saprolegnia monoica, their mode of formation is always such as has just been described, there are other species in which the same plant may have these antheridia with their fertilisa- tion-tubes and at the same time antheridia without tubes, or oogonia without any an- theridia (Aphanomyces scaber, Saprolegnia hypogyna); and lastly there are species or races, extremely like those named above in other respects, which very seldom or never form antheridia. In all these cases the formation of oospheres and oospores does not vary in the smallest detail. The ripe oospores remain dormant dur- ing a time which varies from some days to some months according to the species, and germinate in the same forms as in the Peronosporeae (Fig. 69 D, E). All the different forms of germination de- scribed in the Peronosporeae have also been observed in most of the species of Saprolegnieae which hav
Size: 996px × 2508px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisheroxfor, bookyear1887
