Botany : outlines of classification of plants / [William Ramsay McNab].

  • McNab, William Ramsay, 1844-1889.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: Botany : outlines of classification of plants / [William Ramsay McNab]. Source: Wellcome Collection.

    48/218 (page 30)
    which develope non-sexual plants. Many zoogonidia are formed by rejuvenescence by the cells of the fila- Fig- 2°- ment. Other zoospores are separated, and afterwards attach themselves to the side of the oogonia, form- ing the peculiar dwarf- males, the antheridium be- ing the larger part of the minute male plant. In CEdogonium the filaments are simple ; they are branched in Bulbochaete (fig. 25, p. 35). Order XIII. Fitcaceae. —Brown algae, the green colour of the chlorophyll being obscured by the pre- A, ordinary filament ; Z>, filament Sence a of brown Colour- m'i nlatter (phycophain or melan°Ph>'11)- The Callus oospore : e, vegetative zoogom- jg often large and dichoto- dium ; F, oospore in act of being 0 fertilised by a spermatozoid, s ; G, lllOUSly branched, the forms spermatozoids; in, n, oospheres . , . and antheridia in different stages being Very Varied. The entratme'°o ™escap/' of ^spermato- parts of the thallus often vegetative miment^” masses “ resemble roots (rhizoids) (After Oersted.) an(j a stem and leaves. The structure is simple, consisting of a mass of cell- tissue, resembling protomeristem, the outer layers of cells being smaller than the inner, and forming a kind of limitary tissue. These algae are marine. In Fucus the sexual reproduction is effected by antheridia and Spliceroplea annulina.