Algce7\ 



ELOEA OF NEW ZEALAND. 



225 



Gen. XXXVII. EHODOMELA, Ag. 



(Ag. Syst. p. 196. Grev, Alg. Brit. p. 103. Harv. Phyc. Brit. t. 50, 264. Harv. Ner. Austr. p. 34. Lophura, 



Kiitz. Sp. Alg. p. 850.) 



1. Ehodomela Gaimardi, Ag. Bory, Cog. p. 215. I. 22./. 1. Hook. fil. et Harv. Fl. Ant. v. 2. p. 481. 

 i. 184. Harv. Ner. Austr. p. 35. Lophura Gaimardi, Kiitz. Sp. Alg. p. 851. 



Hab. Akaroa, Blind Bay, and Cook's Straits, Lyall. Hawke's Bay, Colenso. (Native of Antarctic 

 shores.) 



2. Ehodomela cmspitosa, Harv. ; dense csespitosa, bi-triuncialis, fronde tereti ultrasetacea alterne de- 

 composita subfastigiata, ramis creberrimis arcuatis vage divisis ramulisque lineari-subulatis sparsis secundis 

 alternisve plus minus obsessis, stichidiis lineari-subulatis densissime glomerulatis, glomerulo ad latera ramo- 

 rum sessili. 



Hab. On rocks near low-water mark; Occepoto and Parimahu, Colenso. 



Fronds one or two inches high, perhaps more, densely tufted. Stem naked below, once or twice forked, densely 

 and very irregularly branched above ; the outline flabelliform, and the branches subfastigiate. Branches without 

 order, frequently secund, sometimes spreading to all sides, irregularly twice or thrice compounded ; the ultimate 

 ramuli linear-subulate, elongate, arched, acute ; coated with small cells, and quite opaque under the microscope, but 

 the articulations of the axis visible through the cortical layer, when examined with a pocket-lens. Axial tubes four. 

 Stichidia forming very dense glomeruli two lines in diameter, on the sides of the upper branches, linear-subulate 

 like the ramuli, somewhat distorted, and either simple or branched, containing a wavy line of tetraspores. 



" Densely casspitose, in beds, and of a bright emerald-green colour," Colenso. — Allied to R. Gaimardi, but 

 smaller, and more densely and irregularly branched. It differs in many respects from the description given of 

 R.glomerulata, Mont. ; but further we cannot say. 



3. Ehodomela concinna, Hook. fil. et Harv. ; radice discoidea stuposa, fronde elata disticha alterne pin- 

 nato-decomposita (tri-quadripinnata), pinnis minoribus linearibus elongatis pinnulatis, pinnulis a:quilongis 

 brevibus dichotomo-multifidis, ramulis quaquaversis subulatis stepe furcatis, stichidiis oblongis acutis ad 

 latera ramulorum sessilibus tetrasporas pluriseriatas foventibus. (Tab. CXI.) 



Hab. Middle Island : Eoveaux Straits, and Chalky Bay, West Coast, Lyall. 



Frond 8-12 inches high, as thick as sparrow's quill, many times distichously pinnate, ovate in outline ; the 

 lower main branches subhorizontal ; the upper erecto-patent, twice or thrice pinnate-decompound. Penultimate 

 pinnas i-li inch long, set with alternate, dichotomously multifid pinnules, 1-2 lines long, and nearly of equal size 

 throughout the rachis. These are distichously inserted along the rachis, but their own divisions branch in all 

 directions ; the apices divaricating and spine-like. On the multifid ramuli the stichidia are borne. Every part of 

 the frond is opaque, coated with minute cortical cells. — Plate CXI. Fig. 1, plant, natural size; 2, apex of a branch, 

 with ramuli ; 3, a multifid ramulus, bearing stichidia ; 4, a stichidium in situ, enlarged : — all more or less magnified. 



Gen. XXXVIII. BOSTEYCHIA, Mont. 



(Mont. Hist, Cuba, Bot. p. 39. Harv. Phyc. Brit. t. 48. Harv. Ner. Austr. p. 58. Kiitz. Sp. Alg. p. 839. 



Helieothatnnion, Kiitz. Phyc. Gen. p. 433. Stictosipkonia,M. Ant. ii. 483. t. 1S6. f. 1, 2.) 



1. Bostrychia mixta, Hook. fil. et Harv., Lond. J. Bot. v. 4<.p. 270. I. c. p. 539. Harv. Ner. Austr. 

 p. 70. KUtz. Sp. Alg. p. 840. 



Hab. Eocks near high- water mark, Bay of Islands, /. B. II. Otago, Lyall. (Native of South 

 Africa.) 



2. Bostrychia Harveyi, Mont. ; fronde tereti biunciali setacea dichotomo-pinnata, ramis flexuosis pin- 



YOL. II. 3 M 



