16 



.mil Lind. 

 . intensely green, obtuse at apices, at length filled with 



:ompared ihi^ species with specimens ol C comosa from New 

 :ul it t( in possessing filaments more than twice as thick as those of 



id rather than tending u> rigidity, and green rather than fusco-nigrescent. 



\\ , .timen of this plant. 



brandtii n. sp. 



Hauck in Hedwigia XXVII. [888 ]). 

 sa Murray & Boodle in Journal of Botany XXVII. 1889, p. yi pro parte. 



I moro [slands, Johanna, Poniona (just below lowest tide-level) Au^'. 1875. Hildebrandt 



1 Expedition. Stat. .213. Saleyer Island, reef! 



Plant about 6 cm. high, gregarious, tufted, arising from a small felted base, flavescent- 



; filaments decumbent below, colourless and much and irregularly hranched, producing 



itolons and rhizoids; filaments ascending above, green, cylindrical, straight, flaccid, up 



cm. long, 80 — 130^ in diameter, distantly dichotomously branched, the resulting pair of 



branchlets I onstricted once immediately above the dichotomy, and at equal distances 



'•''" ' l 1 ig s - 7 1- 75]- 



This plant, referred to C. comosa by Hauck, was transferred by Mukrav and 11 11 



to C. caespitosa (see p. 62), but differs from both these species. From C. comosa, which it 

 nbles much in habit, it differs in its even constrictions placed immediately above each 

 dichotomy of the upper filaments Tl. YIII. hg. ~-\c). And from c '. caespitosa (our Rhipidodesmis) 

 it differs entirely in the mode of ramincation of its upper filaments. 



The Siboga specimen from Saleyer reef agrees with Hildebrandt's plant in having 

 supra-dichotomial constrictions, but apparently differs in having wider-angled dichotomies 

 Bul is Hl debrandt's specimens are dried material and do not recover their normal 

 : determine what the dichotomial angle would be in fresh plants. 

 The (listribiition so far as is known is confined to the Indian ( >cean. 



2. Avrainvillea Decaisne. 

 1 igs. 7'. 117. 



Historica 1. 



■ i of which we are aware is a small specimen of A. Mazei collected 

 in the Bahama Islands between the years 172^ and \~,- u - It f 1 - preserved 



