Howe: Phycological studies 513 



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intertangled, 35-70 /i in diameter, cylindrical or irregularly inflated here and tli 

 especially at apices, usually a little constricted just above a dichotomy, the dichotomi,_ 

 often near together and the branches sometimes pseudolateral, many of the shorter 

 branches (often apparently and perhaps truly lateral ) terminating in 2-4 or more short 

 small divaricate jirocesses which serve as organs of attachment to adjacent filaments, 

 thus forming more or less of a network ; lilaments of stipe similar but with greater tliver- 

 sity in size, those of interior 55-100 /^ in diameter, those of surface often only 16-30 /z. 

 Type i.ocauty : Antigua, British West Indies ; type specimen in the Sonder col- 

 lection of the National Herbarium of Victoria, Australia. 

 Distribution: Antigua; Guadeloupe; Bahamas. 



We owe to Mr. J. R. Tovey, of the National Herbarium of Victoria, Australia, the 

 privilege of examining a portion of the type material, including, evidently, the plants 

 from which Kiitzing drew his figure r?^. 



A second West Indian species of somewhat doubtful generic position is the fol- 

 lowing : 



Udotea luteofusca (Crouan) Murray, Jour. Bot. 27 : 239. 1889 (nomen 

 seminudum). 



Ftabcllaria luteofusca Crouan ; Maz6 & Schramm, Essai Alg. Guad. 88. i87o-'77 

 (nomen seminudum). 



Plants 4-10 cm. high, fuscous or dark yellowish-brown, uncalcified ; stipe simple 

 or 1-3 times dichotomous, flattened or subterete, 2-7 cm. long, 2-5 mm. wide, corti- 

 cated : tlabelUim cuneate-obovate or irregularly semiorbicular with cuneate base, some- 

 times 4 or 5 flabella to a plant through forking of stipe, each 2-5 cm. long, 1-6 cm. 

 wide, not at all or very obsoletely zonate, corticated, the surface smooth or longitudin- 

 ally somewhat rugulose, the margins erose, lacerate, or irregularly lobed : filaments of 

 the medulla yellowish or yellowish-brown, in several layers or towards the margins 

 almost unistratose, being there commonly visible through the cortex and giving the 

 plant a venulose appearance under a lens, 50-80 /i in diameter, cylindrical or slightly 

 and iriegularly constricted, their falsely lateral branches forming the intricate, laby- 

 rinthine cortex by repeated divaricate often somewhat zig-zag dichotomies, the ultimate 

 branchlets of the corticating filaments 4-10," in diameter, decolorate. 



Type locality: Lake Simpson, St. Martin, West Indies; type specimen no. 

 140J of the Maze & Schramm collection in herb. Crouan (in herb. Bornet, Paris). 

 Distribution : Known only from the type locality. 



This interesting plant offers points of contact with the genera Avraiitvillca, Udotea, 

 and Cladocephalus (Bull. Torrey Club 32 : 569), but is perhaps most at home in Udotea, 

 where Murray (/. c.) has doubtfully placed it. But we find no grounds for supposing 

 with Murray that this " form " is an " imperfect state." In color and general habit 

 it has most in common with Avrainvillea, but it is corticated ; the general character of 

 the cortex, however, is rather different from that of any other described species of 

 Udotea, the corticating filaments being much more regularly dichotomous than in 

 Udotea Desfontainei and without the ultimate lateral nodular excrescences or irregularly 

 cristate-pectinate coherent branchlets of that species. In the nature of the cortex it 

 closely resembles Cladocephalus scoparius ; in fact, the species stands in much the same 

 relation to Cladocephalus that Udotea conglutinata does to Penicillus, Ud tea eon^lu- 

 tinata being a Penicillus except in having a flabellum instead of a capitulum. 



