58 ECTOCARPUS. 



Frith of Forth, Sir John Richardson. — Allied to the last, but larger, 

 and chiefly distinguished by its racemose s2)ores. 



Sub-order 2. Ectocarpe.e. 



EcTOCARPDS. Lyngb. [Plate 9, C] 



Filaments capillary, jointed, olivaceous or brown, flaccid, 

 without longitudinal stria?. Fruit either spherical or ellipti- 

 cal, external or imbedded spores-, or lanceolate, linear or co- 

 nical siliciiles (pod-like bodies) ; or granular masses formed 

 in consecutive cells of the branches.. — Name s^ixoj, Kapirog, 

 external Jruit. 



* Secondary branches alternate , fascicled or secund. 



1. E. siliculosus, Lyngb. ; tufts yellowish or pale olive- 

 green, somewhat gelatinous, soft ; filaments slender, exces- 

 sively branched ; ultimate branchlets alternate or secimd ; 

 silicules stalked, subulate, very acute. Hook. Br. Fl. ii. p. 

 325 ; E. Bot. t. 2319 ; Wyatt, Alg. Danm. No. 172. Harv. 

 Phyc. Brit. t. clxii. 



Between tide-marks, on Algae, corallines, &c. common. Annual. Sum- 

 mer. — Tufts 6 — 18 inches long, cloud-like, of a yellowish or pale colour, 

 occasionally rusty brown. Filaments excessively slender, mncli and irregu- 

 larly branched, somewhat gelatinous, quickly decomposing in fresh water ; 

 branches irregularly set, of various lengths, bearing a second and third 

 series of multifid ramuli ; all the divisions alternate or secund, the extreme 

 ramuli long and very frequently secund, erect. Silicules subulate, resem- 

 bling por/s, borne on short stalks by the ramuli. 



2. Yj.amj)]iihius, Harv. ; tufts short, loose, soft, pale olive; 

 filaments very slender, subdichotomous ; ultimate branches 

 alternate, spreading; articulations twice or thrice as long as 

 broad ; silicules linear-attenuate, spine-like, mostly sessile, 

 scattered. Harv. Phyc. Brit. t. clxxxiii. 



In muddy ditches of brackish water, near the coast. Tide ditches of the 

 Avon, near Bristol, 71//-. Thwaites. — Filaments 2 — 3 inches long, forming 

 small indefinite tufts. Ramuli scattered, thorn-like. 



3. 'E.fenestratiis, Berk. ; pale green, very slender, forming 

 small tufts ; filaments not much branched ; branches dis- 

 tant, alternate, furnished with a few long and simple, alter- 

 nate ramuli ; articulations of the branches twice or thrice as 

 long as broad, pellucid ; silicules stalked, scattered, at first 

 clavate, then elliptic-oblong, obtuse, densely striate trans- 

 versely and cross-barred, dark brown. Harv. Phyc. Brit. t. 

 cclvii. 



Salcombc, Mrs. Wyatt. May. The habitat not exactly stated. — It 



