PLATE XV. 



Portion ol margin of frond showing young dichotomies in course of forma- 

 dien little branchi ometimes very abundant and doubtless represent what 



lRDH (lo described .is the cortex. 200. 



Flabellaria (see also figs. 29 31 on plate IV 



I 'aria minima Gepp (= Udotea minima Ernst). Habit of plant, showing creepin ilarly 



branched, colourless basal filament, emitting a few dichotomously branched, green, ascendin 

 free filaments. 8. [after lunst in Beih. z. Bot. Centralbl. XVI. 1904. Tab. VII. fig. 6). 



124. Ditto. Young plant showing the simplicity of str.ucture that characterises the stipes and frond 



in F. minima. Some twenty ascending filaments have associated themselves together into 

 .1 non-corticated stipes, and, branching above almost in one plane, have expanded into a 

 Habellum. A free filament is shown alongside. 8. Aftei Ernst loc. cit. Tab. VII. fig. 



125. Ditto. Portion of well-grown Habellum near its margin, showing the main filaments held together 



by the production of .1 few lateral branchlets which spread obliquely across them and hete 

 and there are interwoven with them. These lateral branchlets are developed only at the time 

 of vigorous growth. 90. aftei Ernst loc. cit. Tab. VIII. fig. 



Rhipilia. 



'■ : . Rhipilia tomentosa Kut/. f. typica. Habit '>t' plant, nat. size. (Antilles, Herb. Kutzing in Herb 



Weber van I Ihc original of fig. a in Kützing's Tab. Phyc. VIII. tab. 2N. 1 1. 



: \2~. l)itt<>. Erond-filatnents ame, showing p teral branchlets terminated by a 2 — 6-fid 



tcnaculum of 2 or more short pi 4°- 



I • l)itt.>. 1'art of s.mie enlarged. a lateral branchlets. showing tenacula applied to neighbouring 



branchlets. -•<><>. /' dichotomy in thicker main filament, showing annular ingrowths or 

 200. 

 ,. Rlupiha tomentosa f. zonata forma nov. Habit of plant, nat. size (St. Jan. B'órgesen n". 22 

 I [30. Rlupilia tenaculosa n. sp. Habit of plant (an explanate flabelliform example), nat. size. Ofl 



Barra Grande, 30 fathoms, mar Pernambuco 'enger" Expedition in Herb. Mus. Brit.). 



131. Ditto. Another plant of the same gathering, an infundibuliformly peltate example. nat. sj zc . 

 ■ Ditto. Frond-filaments beset with numerous si ral branchlets or tenacula, and bearing a 



few pseudo-lateral branchlets of dichotomial origin, 40. 



