Botany. 423 
of the higher plants, and in most animals, where the pair is of two sexes, 
the sterile fertilizing the fertile one; but here there are two sorts of 
fertile individuals, which mature each their particular kind of seed, or 
spore, independently. ‘These Algi, moreover, like the Fuci, produce 
len of Phenogamous plants, although they have not been observed to 
execute vine spontaneous movements which they do in the Melanosper- 
s been commonly assumed that only one of these. two kinds 
of ripetidietbes bodies could be regarded as true spores, the other being 
supposed to be of the nature of a gemmule or bud, analogous to the bulb- 
lets of the Lilium bulbiferum, for instance, only of the utmost simplicity 
of structure. But aut thorities are by no means agreed as to which is 
the real spore, and which the gemmule. Our author (in his Manual 
of the British Marine Algz) had very plausibly maintained that the 
smaller bodies, contained in a ne an were ath true spores, and 
The sa s been 
? 
edimorphous in fra cst and that both kinds are veritable spores, 
equally fertilized by the antheridia. 
t may here be feunavked; that some direct evidence as tetbpigorse 
by the antheridia has lately been furnished, in the Fuc 
Thuret, whose observations were communicated to the Preis lle 
of Sciences last spring. The spores of certain common dicecious spe- 
cies, received in a vessel of sea water, apart from any admixture of the 
obntsinll of the antheridia, uniformly failed to germinate. While those 
h 
added, promptly germinated. Impregnation is eer inferred to 
take place in this family, in much the same manner as in the Rhizo- 
carpee, (see vol. of this Journal, p. 31, et $64, ) that is, the matured 
spore receives the fertilizing influence after its separation from the 
parent. 
The classification of the Rhoiloupcrmeis:' is more recondite than that 
of the Melanospermee ; and most of the essential characters can only 
of Delesseria Americana, here assumes the rank of a new gens, which 
Dr. nasty ‘ag sspeoarately called Grinnellia, “ in honor of Henry 
Grinnell, ., of New ork, whose whole conduct in promotin st 
= the accomplished ssi indefatigable author may have the oppor- 
