■ 



. Bi odle 



in pro part 



i iurn. ol Bot. III. [844. p. .;-- 



Phyc. VIII. 1858. p . 1 j, tab. 28, II. 



t Schramm Algues de la Guadeloupe, 2 m « Edit. 



Vlurray in Journ. of li"t. XXVII. 1889. p. 238 (pro parti 

 I oni Syll. Alg. I. [889. |>. 5 [4. 

 > Howe in Buil. Torrey Bot. < lub. XXXII. 1 9 05. p. 565, tab. XXIII, fig. 1. 



I ollins Green Alg. \. Amer. in Tufts College Studies II. [909. p. 



n in Vid. Medd. nat. Foren. Kjöbnhavn. 1908 p. 36, figs. 5, 6. 



ladeloupe, Basse Terre, sur la coquille du Strotnbus gigas Mazè n" 30 i clc série 

 in Herb. Mu^. Brit.! n" 30 in rlerb. Kew! Bahamas, Cave Cays, Exuma Chain, Howe 

 Bahamas, Cockburn Harbor, South Caicos, Howe in Phyc. Bor. Amer. n° 1478! — 

 Jamaica, fide Howe. - — f St. Jan, Maho Bay, at a depth of 16 niet.. Börgesen. 



"Olivaceous when living, on drying often slightly tinged with yellow or verging toward 

 rous, or at the margins sometimes fuscous, caespitose or gregarious from a short scarcely 

 ■ rhizomatous base; stipe 0.5 — 4 cm. long, fluttened or subcylindrical, simple or occasionally 

 * dichotomous at base: flabellum varying from reniform-suborbicular with cordate base to 

 ■cuneiform-obovate, 1 — 7 cm. broad, entire, erose, or sometimes lobed, thin and membranous 

 "or sometimes tliicker and coriaceous, compact in texture with a smooth or slightly wrinkled 

 ■surface, tor the most part distinctly zonate, now and then tending to form serially superposed 

 "tl.ibclla at the margins of the zones: filaments of flabellum slender, tortuous, interwoven, 

 "usually lightly and irregularly torulose, rarely somewhat moniliform, mostly 6 — 24a in diam. ; 

 *those of interior a little larger (reaching 35 juf), more chlorophyllose and less tortuous: angle 

 "of dichotomy commonly acute (about 30 — 45 ), sometimes obtusc (reaching 1 20 )". — M. A. 

 in Buil. Torrey Bot. Club XXXII (1905) pp. 565, 566 [Figs. 1 10, 111]. 



In lance with the Vienna rules of nomenclature, we retain for this species the 



t specific name, to which 110 doubt can be attached. Though no description was published 



by Mazi and Schramm with Crouan's binomial, a diagnosis was supplied by Mürray and Boodle 



rhey included in their . /. sordida some plants which belon^ to other species; hut 



their type-specimen (fig. in»). Ma/k n" 30, stands good, and is preserved in the British Museum. 



rightly reject Udotea sordida Mont. from the synonomy of this species. Montagne's plant 



ted in the Philippine islands by Cuming and is a synonym of Avrainvillea erecta. 



and careful description of ih<- present species under the name of ./. levis 



that we have taken the liberty of quoting it in full. 



Mr. Hov iks of "the filaments of the surface being often more slender, more 



chlorophyllose than those of the interior". In some plants of Ma/k's n° 30 



ined, these very slender (6 — 10 7. diam.; peripheral filaments are locally 



parts of the frond. We give in fig. 111 some typical filaments from 



it, showing the supra-dichotomial branches to be subtorulose and more coloured 



■ their base. 



