Feb., 1909.] 
The Classification of Plants, IV. 
449 
17. Florideae. 1835 species. 
Mostly marine red or purple algae, often of considerable size, 
filamentous or thalloid; reproduction by means of non-ciliated 
sperms produced in antheridia consisting of definite groups of 
cells, and eggs produced singly in the base of an oogonium which 
is prolonged above into a slender trichogyne. Plants with a 
definite alternation of generations the fertilized egg having a com¬ 
plicated development but in the simpler cases giving rise to a ju¬ 
venile sporophyte body from which one to many carpospores are 
produced which on germination develop into a second sporophyte 
stage on which tetraspores are produced from which the game- 
tophyte is again propagated. 
18. Chareae. Stoneworts. 160 species. 
Green filamentous erect, mostly freshwater algae, attached at 
the base by means of rhizoids, with stems distinctly segmented 
into nodes and internodes, the nodes being marked by whorls of 
branches; plants usually with an incrustation of lime and the 
cells of the stem and branches often covered with a cortical 
layer of smaller cells; without an alternation of generations; 
oogonia rounded covered by a cortical layer of branches, antheri¬ 
dia .compound and very complex composed of united branches 
to form a hollow globular structure containing sperm-bearing 
filaments; spermatozoids spirally coiled, biciliate; no nonsexual 
spores present. 
Eumycetae. 
19. Monoblepharideae. 0 species. 
Small coenocytic fungi with a nonseptate or nearly nonsep- 
tate mycelium, with uniciliated zoospores and with a typical sex¬ 
ual reproduction ; saprophytic and aquatic; eggs stationary in the 
oogonium which opens to admit the uniciliated spermatozoids 
20. Zygomycetae. 180 species. 
Saprophytic or parasitic fungi with a nonseptate or nearly 
nonseptate mycelium having a conjugation of equal or nearly 
equal branches, one of which does not penetrate the other to any 
extent, the result of conjugation being a simple or coenocytic 
zygospore; sometimes parthenogenetic; nonsexual spores usually 
non-motile. 
21. Oomycetae. 185 species. 
Mostly parasitic fungi with a nonseptate or nearly nonseptate 
mycelium, with conjugating branches, the one being much larger 
than the other which penetrates into its interior, the result being 
a simple or coenocytic sexual spore; sometimes parthenogenetic; 
nonsexual motile spores also produced which frequently develop 
in conidia. 
22. Ascomycetae. 12,250 species, besides 8,250 Lichens and 
13,500 Deuteromvcetae. 
