30 SYNOPSIS OF BRITISH SEAWEEDS. 



31. lomentaria (The jointed Chorda)] frond membranj 



constricted at distant intervals, the interstices inflated, Lyngb. 

 Eyd. Dan.p.74>.t L8. (Aha-, PL VI il. Fig. 32.) 

 Chorda fistulosa, Zanard. Scytosiphon Lomentaria, JCudl. S. 



Blum, far., Ag. Solenia fuscata, Bory. Asperococcus cos* 

 taneus, Carm. Chlorosiphon Shnttleworthianus, A'/i/z. 



Hal). Atlantic shores of Britain. On rocks, Btones, and the 

 smaller Algae, in tide-pools. Annual. Summer and autumn. 

 Abundant . 

 A common plant, of little beauty, widely dispersed 

 through the temperate oceans of both hemispheres. In a 

 young state no septa are visible externally, the frond being 

 filiform. In this condition it is sometimes a little difficult 

 to distinguish specimens of Chorda lomentaria, from nar- 

 row ones of Asperococcus echinatus, except by their more 

 chestnut colour and more polished surface, and Captain 

 Carmichael has described such individuals under the name 

 of A. castaneus. 



Oedee 4. DICTYOTACEM. 

 XIV. CUTLERIA. 



32. multifida (The many-slit Cutleria) ; frond thickish, poly- 

 morphous, flabelli'brm, irregularly cleft into numerous nar- 

 row iacinia? ; axils very acute ; apices attenuated, pencilled, 

 Grev. Alg. Brit. p. 60. t. 10. (Atlas, PI. IX. Fig. 33.) 



Zonaria multifida, Ag. Dictyota penicillata, Lamour. J), mul- 

 tifida, Bory. Sporochnus multifidus, Spreng. Ulva multi- 

 fida, Smith. 

 Hah. Coasts of England and Ireland. On rocks and shells in the 

 sea, in 4-15 fathoms water. Annual. Summer and autumn. 

 Rare. 

 Although found on many parts of our coasts, Cutleria 

 multifida is still considered a rare species, partly perhaps 

 from its place of growth being beyond the limit of ordinary 

 tides. Occasionally, after stormy weather, it is washed up 

 in some plenty. JN T o genus can be more distinct, and few, 

 among the Dictyotea, have a more delicate or curious 

 structure. The fruit is very remarkable. 



XV. HALISERIS. 



33. polypodioides (The Polypody -like Ha User is); frond dicho- 



tomous, entire at the margin, plane; spots of fructifici 

 linear, disposed along the midrib, Ag. Sp. Alg. v. l.p. 142. 

 (Atlas, PI. IX. Fig. 31.) 



