GEPP—MARINE ALGZ AND MARINE PHANEROGAMS. 385 
Uporera, Lamour. 
23. Udotea glaucescens, Harv. Algze exsicc. Friendly Islands, no. 82; J. G. Agardh, 
Till Alg. Syst. viii. (1887) p. 70. 
Cargados Carajos, 30 fms. 
Geogr. Distr. Friendly Islands. Fiji. Cape York. 
This species has not hitherto been recorded from the Indian Ocean, though its near 
ally U. javensis, Gepp (Rhipidosiphon javensis, Mont.), occurs in the Malay Archipelago 
and Ceylon. 
24. U. conglutinata, Lamour. Polyp. flex. (1816) p. 312; De Toni, Syll. Alg. i. (1889) 
p- 507. 
Amirante, 30 fms. Coetivy recf. Cargados Carajos, 30 and 47 fms. 
Geogr. Distr. Atlantic. Indian Ocean. Pacific. 
25. U. palmetta, Decne. Mém. sur les Corallines etc. in Ann. Sci. Nat. 2° sér. xviii. 
(1842) p. 105; De Toni, Syll. Alg. i. (1889) p. 506. 
Cargados Carajos, 45 fms. 
Geogr. Distr. Indian Ocean. 
This species has, so far as we know, never been collected since the original plant was 
described by Decaisne (/. ¢.). The original locality whence this species came has never 
been recorded. It is indicated neither by Decaisne in his description nor on the label 
of the type specimen preserved in the Paris Herbarium. Decaisne merely says “ in 
Herb. Petit Thouars, nune Mus. Par.’ Through the kindness of Messrs. Hariot and 
Lignier we have been accorded the privilege of examining Decaisne’s type now in 
Paris, as well as the specimen preserved in Herb. Chauvin at Caen, which together 
have hitherto constituted the only known material of the species. The home of 
U. palmetta remained therefore a mystery until the present collection of Mr. Stanley 
Gardiner yielded fresh examples, which point to the conclusion that the original locality 
was situated in the Indian Ocean. As stated above, Mr. Stanley Gardiner’s specimens 
were obtained from a depth of 45 fathoms and in a living state. It would be extremely 
interesting if light could be thrown upon the following questions concerning Decaisne’s 
type and the specimen in Herb. Chauvin. Did they both come from the same locality ? 
Were they collected by Du Petit Thouars? From what island or coast did they come ? 
And from what depth were they obtained? If the species is of restricted distribution, 
and occurs only at so great a depth as 45 fathoms, the explanation of its being so 
scantily represented—namely, in only two herbaria—is obvious. 
The thallus of Udotea consists, as is well known, of unicellular, dichotomously 
branched filaments, which in some species are simple, as in U. conglutinata, and in 
others bear numerous short lateral branchlets varying in form according to the species. 
U. palmetta is one of the group characterised by bearing these lateral branchlets, 
and they are of the simpler type, being short, undivided, or more or less forked, and 
borne now along one side, now along the other side, of the same main filament, but 
never on both sides at once. They are not sufficiently large to form a cortex like that 
ive. 
