160 PRELIMINARY REPORT UPON THE 



N. purpureum — IHelminthoeladia purpurea] — (Purple Nemaleon). On rocks. 

 Whitsand Bay. Annual. Summer. 



Dudresnaia coccinea (Scarlet Dudresnaia). Sound. Annual. Summer. Rare. 



D. divaricata — \Helmmthora divaricatd] — Divaricate Dudresnaia). Wemburj' 

 Bay. Annual. Summer and autumn. 



Crouania attenuata (Attenuated Crouania). On corallines and small algae. Fire- 

 stone Bay. Annual. Autumn. Very rare. 



Order XIII. Ceramiacese. 



Ptilota sericea — \_Ptilota elegans"] — (Silken Ptilota). On rocks, and in pools. 



General. Perennial. Summer and autumn. An elegant variety is sometimes 



found on the outer shores, which approaches very near to Ptilota plumosa. 

 Microcladia glandulosa (Glandular Microcladia). On Rhodymenia laciniata and 



Ceramium rubrum. Sound. Annual. From March to September. Very 



rare. Taken hy J. Gatcombe. 

 Ceramium rubrum (Red Ceramium). In pools and deep water on the shores. 



General. Perennial. All seasons. 

 C. decurrens (Decurrent Ceramium). Bovisand. Annual. Autumn. Rare. 

 C. Deslongchampsii (Deslongchamps' Ceramium). On stones, at half-tide mark. 



Mount E'lgcumbe. Annual. Spring. 

 C <?/a;;Aa«Mm (Diaphanous Ceramium). On rocks, and in tide-pools. Bovisand; 



Mewstone. Annual. Summer. 

 C. gracillimum (Very slender Ceramium). At low-water mark. ?.Iount Batten j 



Bovisand. Annual. September. Rare. 

 C. fiabelligerum (Fan-bearing Ceramium). Parasitical on Cladostephus spongiosus. 



Hoe. Annual. Spring. 

 C. fastigiatum (Level-topped Ceramium). On rocks, at low-water mark. Mount 



Batten. Firestone Bay. Annual. Autumn and winter. Rare. 

 C. nodosum (Knobbed Ceramium). Washed up from deep water. Annual. 



Summer. 

 C. strictum (Straight Ceramium). On rocks, at half-tide. General. Annual. 



Spring and summer. 

 C. echionotum (Prickly Ceramium). Deep water. Bovisand ; Mount Edgcumhe. 



Annual. Summer. 

 C. acanthonotum (One-spined Ceramium). On rocks. General. Annual. Spring 



and summer. 

 C. ciliatum (Ciliated Ceramium). In pools. General. Annual. Spring and 



summer. 

 Spyridia filamentom (Filamentose Spyridia). At low-water mark. Firestone Bay ; 



Bovisand. Annual. Summer. 

 Griffithsia equisetifolia (Equisetum-leaved Griffithsia). Low-water mark. Bovi- 

 sand ; Whitsand Bay. Perennial. Summer. 

 G. devoniensis (Devonshire Giiffiihsia). Low-water mark. Mount Edgcumhe; 



Torpoint; l?eggar's Island. Annual. Summer. 

 G. corallina (Coral-like Griffithsia). On rocks, near low-water mark. Annual. 



Summer. 

 G. secundiflora (Side-fruited Griffithsia). On one rock, at low-water mark. 



Bovisand. Annual. Spring and summer. Very rare. First found by Rev. 



W. S. Hore. 

 G. sefacea (Bristly Griffithsia). On rocks, and in pools. General. Perennial. 



Fruiting in winter. 

 fVrangelia multifida (Many-slit Wrangelia). On rocks. Mount Edgciimbe; Mount 



Batten; Bovisand. Annual. Summer. 

 TV. multifida. vnr.pilif era. On rocks. Mount Edgcumbe ; Mount Batten ; Bovi- 

 sand. Annual. Summer. 

 Seirospora GriffiUisiana (Mrs. Griffiths's Seirospora). Sound. Summer. Annual. 



Very rare. Taken bv J. Gatcombe. 



