36 CUTLERIA. 



I. CUTLERIA. Grev. [Plate 6, A.] 



Root clothed with woolly fibres. Frond flat or compressed, 

 cartilagineo-membranaceous, ribless, somewhat fan-shaped, 

 irregularly cleft. Fructification : dot-like tufts of pedicellate 

 spores, scattered over both surfaces of the frond ; each spore 

 containing several sporules. Antheridia on distinct plants, 

 linear, transversely dotted, attached to minute, tufted fila- 

 ments, occupying the position of the sori. Named by Dr. 

 Greville in honour of Miss Cutler, a distinguished British 

 Algologist. 



1. C. multifida, Sm. ; frond thickish, polymorphous, fla- 

 belliform, irregularly cleft into numerous, narrow laciniae ; 

 axils very acute ; apices attenuated, pencilled. Grev. Alg. 

 Brit. p. 60, t. 10; Hook. Br. Fl. ii. p. 281; Wyatt, Alg. 

 Danm. No. 61 ; E. Bot. t. 1913 (Ulva) ; Harv. Phyc. Brit, 

 t. Ixxv. 



In the sea, on rocks and shells, in 4 15 fathom water. Annual. 

 Summer and autumn. Coasts of England and Ireland; very rare in 

 Scotland. Orkney. Frond 2 8 inches long, of a broadly wedge-shaped, 

 or somewhat fan-shaped outline, cleft into several segments, often nearly 

 to the base, and these again splitting into others ; segments linear, 1 3 

 lines wide, slightly dilated upwards. Fructification scattered over the 

 whole frond, dot-like, prominent. Substance between cartilaginous and 

 membranaceous, at first crisp, but becoming flaccid and closely adhering 

 to paper in drying. Colour olivaceous, often with a rusty hue : young and 

 perfect plants are frequently fringed with minute fibres. 



II. HALISERIS. Tozzetti. [Plate 6, B.] 



Root, a mass of woolly filaments. Frond flat, linear, mem- 

 branaceous, with a midrib. Fructification : ovate spores, 

 forming distinct sori or groups, mostly arranged in longitudi- 

 nal lines. Grev. Name, axj, the sea, w^s, endive. 



1. H. polypodioides, Desf. ; frond dichotomous, entire at 

 the margin, spots of fructification linear, elongated, forming 

 a line at each side of the midrib. Grev. Alg. Brit. p. 63, t. 

 8 ; Hook. Br. Fl. ii. p. 282 ; Wyatt, Alg. Danm. No. 12 ; 

 E. Bot. t. 1758 ; Harv. Phyc. Brit. t. xix. 



On rocks and stones in the sea, in tide-pools, and in 25 fathom water. 

 Biennial? Grev. August to October. Several places in the south of 

 England. Shields beach, Mr. Winch. West and south of Ireland. Root 



