AlgcB.\ 



FLORA OE NEW ZEALAND. 



245 



apices obtuse. Tetraspores attached to the walls of cavities hollowed out of the cortical layer of the branches, over 

 which they are abundantly scattered. The structure of the frond is similar to that of A. Sinclairii, but the cortical 

 layer does not effloresce on immersion in fresh water, after having been dried. — Plate CXVI. A. Fig. 1, plant, and 

 2, the same, var. /3, both of the natural size ; 3, cross section of a minute portion of the frond, with the immersed 

 tetraspore-cavities ; 4, tetraspores -.—both highly magnified. 



Tribe VIII. SQUA31ARIEM 



Gen. LXVI. PETSSONT5JELIA, Dene. 



(Dene. PI. Arab. p. 168. J. Ag. Alg. Medit. p. 93; Sp. Alg. ii. 499. Kiitz. Sp. Alg. p. 695. Harv. Phyc. Brit.) 



1. Peyssonnelia rugosa, Harv.; fronde arctissime adnata expansa orbiculari intense rubro-fusca, super- 

 ficie rugosissima. 



Hab. On the surface of sand-covered rocks, Cape Kidnapper, Colenso. 



Fronds 1-2 inches broad, attached by the whole of the under surface, more or less orbicular, the upper surface 

 wrinkled all over without regularity. Colour a very dark reddish -brown. Substance membranaceo-coriaceous, 

 thicker than in P. Dubyi.—We have not seen fruit, but the structure of the frond is the same as in others of this 



Tribe IX. HELMINTHOCLADIEJE. 



Gen. LXVII. NEMALION, Duty. 



(Duby, Bot. Gall. p. 959. J. Ag. Sp. Alg. ii. 417. Kiitz. Sp. Alg. p. 712, etc.) 



I. Nemalion ramulosum, Harv.; fronde vermiform! compressa (2-3 lineas lata) quaquaversnm ramosa 



vel subdichotoma, ramis crebris insequilongis patentissimis simplicibus furcatisve iterum ramulosis, apicibus 



obtusis. 



Hab. Otea, Lyall. 



Frond 6 inches long, 2-3 lines wide, compressed, once or twice forked, and densely set with lateral branches 

 and ramuli, spreading irregularly to every side. Branches of very unequal lengths, long and short intermixed ; in 

 our specimens 1-2 inches long, horizontally spreading, obtuse, simple, or set with lateral ramuli, their ends often 

 divaricately forked. Axis composed of densely interwoven, slender filaments ; periphery of elongated, dichotomous 

 filaments. Fruit unknown. — This appears a well-marked species, but probably varies much in ramification. We 

 have seen very few specimens. 



Gen. LXVIII. SCINAIA, Bivona. 



(Bivona, in L'Iride, 1822. J. Ag. Sp. Alg. ii. 420. Ginannia, Mont. Canar. p. 162. Endl. 3rd Suppl. p. 40. 

 Harv. Phyc. Brit. t. 69. Kiitz. Sp. Alg. p. 715, etc.) 



1. ^cama, furcellata, Bivona. J. Ag. Sp. Alg. v. 2. p. 422. Ginannia furcellata, Mont. Harv. Phyc. 

 Brit. t. 69. Eooh.fil. et Harv. in Load. J. Bot. v. 4*. p. 548. Ulva furcellata, E. Bot. t. 1881. 

 Hab. East Coast, Cunningham. (Native of temperate and subtropical seas.) 



Tribe X. BHODTMENIACEjE. 

 Gen. LXIX. PLOCAMIUM, Lamour. 



(Harv. Fl. Ant. p. 186. Ner. Austr. p. 121. J. Ag. Sp. Alg. ii. 392. Plocamium, Thamnophora, et Thamnocar- 



pus, Kiitz. Sp. Alg. p. 883.) 



1, Plocamium coccineum, Lyngb., Hyd. Dan. p. 39. t. 9. Harv. Phyc. Brit. t. 44. Hook. fit. et 



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