Sek. MELANOSPERME^. ( 69 ) Fam. DICTYOTEiE. 



Plate CLV. 

 HALISERIS POLYPODIOIDES.— ^i/. 



Gen. Chak. — Frond membranaceous, linear, flat, with a midrib ; root a dense mass of 

 woolly fibres. Fructification : roundish or ovate spores collected into oblong son, 

 and mostly arranged in longitudinal lines. Name from &As, "the sea," and (xepts, 

 "endive," 



Haliseris 2)oIi/podioides. — Frond from a nari'ow base, linear oblong, 

 dichotomous, apices rounded, forked sori oblong, arranged in longitudinal 

 series on each side of the midrib. 



Haliseris poJypodioides. — Ag. Sp. Alg. vol. i. p. 142; Syst. p. 262; Spreng. Syst. 

 Veg. vol. iv. p. 328; Ch-ev. Alg. Brit. p. 64, t. 8; Hook. Br. Fl. 

 vol. ii. p. 283; Mach. Fl. Hib. part 3, p. 178; Wyatt, Alg. Damn. 

 No. 12; Kiltz. Phyc. Gen.-p. 340, t. 23 ; 3{ont. PL Cell. Canar. p. 148; 

 Harv. P. B. plate 19; Ilarv. Man. p. 36 ; Marv. Syn. p. 30 ; Alias, 

 plate 9, fig. 34; /. G. Agardh, Sp. Oen. Alg. vol. i. p. 117. 



DiCTTOPTERis polypodioides. — Lam. Jour. Bot. p. 19, sec. Ag. 



DiCTTOPTERis elongata. — Lam. 1. c. p. 18, sec. Ag. 



Fucus polypodioides. — Desf. Fl. All. vol. ii. p. 421 ; Lam. Diet. p. 32, t. ^4, f. 1. 



Fucus memhranaceus. — Stack. Ner. Brit, p. 13, t. 6 ; Turn. Syn. Fuc. vol. i. 



p. 141 ; With. Br. PI. vol. iv. p. 93 ; E. Bot. t. 1758 ; Turn. Hist. 



t. 87. 



Fucus amiiguus. — Clem. Ess. p. 310. 



Ulva polypodioides. — Dec. Fl. Fran. vol. xi. p. 15, 



Hab. — On rocks and stones in the sea, from two to six fathoms. Perennial. Summer 

 and autumn. Several places along the southern shores of England, not uncommon. 

 Shields (Mr. Winch) ; Miltown Malbay {Dr. Harvey) ; Youghal (Miss Ball) ; Round- 

 stone (Mr. M'Calla) ; Jersey (Misses White and Turner). 



Geoge. Dist. — Atlantic and Mediterranean shores of Europe. North of Africa 

 (Desf.) ; Ceylon (Herb. Linn.) ; South Africa (Ecklon) ; Bahia (Martius) ; Canary Islands 

 (Despreaux). 



Description. — Root, a flattened disc, densely covered over with slender 

 matted fibres. Fronds much tufted, six to ten inches in length, and 

 from a quarter to half an inch wide upwards, narrow, and nearly cylin- 

 drical at the base, widening for an inch or more, then oblong, flat, with 

 a stout midi-ib extending to the apex, which is rounded and obtuse; 

 the margins at first entire, but at length spht down obliquely to the 

 midi-ib into numerous broad lacinisc, especially in the older parts ; 

 branches dichotomous, sometimes secund, with, not unfrequently, 



