FAUNA AND FLORA OF PLYMOUTH SOUND. 161 



Callithatnnion Plumula {L\tt\e Feather CMithsimmon). General. Annual. Spring 



to winter. 

 C. cruciatum (Crossed Callithamnion). Torpoint. Annual. Summer. 

 C. Turneri (Turner's Callithamnion). Bovisand. Annual. Summer. 

 C. barbatum (Bearded Callithamnion). Hoe. Annual. Summer. 

 C^/;<»ia (Feather Callithamnion). On sterna oi Laminaria. Summer. 

 C. Brodicsi (Brodie's Callithamnion). Torpoint. Annual. Summer. 

 C. tetragonum (Four-angled Callithamnion). Bovisand. Annual. Summer. 

 C. brachiatum (Armed Callithamnion). On Laminaria. Werabury Bay. 

 C. tetricum (Rough Callithamnion). On sides of rocks. General. Annual. Summer. 

 C. Hookeri (Hooker's Callithamnion). On rocks. Hoe. Annual. Summer. 

 C. roseum (Rosy Callithamnion). Ou mud-banks and stones. Annual. Spring 



and summer. 

 C. byssoideum (Byssus-like Callithamnion). On corallines and stones. Annual 



Spring. 

 C. polyspermum (Many-seeded Callithamnion). On Fuci. Mount Edgcumbe 



Annual. Spring. 

 C. Borreri (Borrer's Callithamnion). On rocks and stones. Mount Batten ; Tor 



point ; Anthony-passage. Annual. Summer. Rare. 

 C 5'race7//»z2<w (Very graceful Callithamnion). Mount Batten. Annual. Autumn 

 C. thuyoideum (Cypress Callithamnion). On sides of rocks. Hoe ; Mount Edg 



cumbe. Annual. Summer. 

 C. corymbosum (Corymbose Callithamnion). Torpoint. Annual. Spring. 

 C spongiosum — [_CalUthamnion granulatuni] — (Spongy Callithamnion). Bovisand ; 



Firestone Bay. Annual. July and Augnst. 

 C. pedicellatum — \_Corynesporapedicellata] — (Pedicellate Callithamnion). In rock- 

 pools. Cremill ; Mount Batten. Annual. Summer. 

 C. Rothii (Roth's Callithamnion). Bovisand Pier. Perennial. Winter. 

 C.floridulum (Gay Callithamnion). In pools. Hoe. Annual. Summer. 

 C. Daviesii (Davies' Callithamnion). Parasitical on Ceramium rubrum. Annual. 



Summer. 

 C. virgatulum (Little twig Callithamnion). Parasitical on Ceramium rubrum. 



Annual. Summer. 



8uh-Glass III. — Chlorospeem^ oe Confeevales. 

 (Grass-greeu Seaweeds.) 



Order XIV. Siphonacece. 



Codium Bursa (Purse Codium). One found on a buoy in Stonehouse Pool. Summer. 



C.iUkcjeieiii (Adhering Codium). Weoibury. Annual. Summer. 



C. tomentosum (Tomentose Codium). At low-water mark. Bovisand. Annual. 



Summer. 

 Bryopsis plumosa (Feathery Bryopsis). General. Seldom appearing in the same 



place two following years. Annual. Summer. 

 jB. %jw«o/rfes (Hypnum-like Bryopsis). Trevol; Mount Batten. Annual. Summer 



and autumn. 



Order XV. Gonfervacese. 



Cladophora pellucida (Transparent Cladophora). In rock-pools, and on stones. 

 Firestone Bay ; Hoe. Annual. Spring and summer. 



C. Hutchinsice (Miss Hutchins' Cladophora). In rock-pools, and on stones. Fire- 

 stone Bay ; Hoe. Annual. Spring and summer. 



C. diffusa (Diffused Cladophora). In rock-pools, and on stones. Bovisand. Annual. 

 Spring and summer. 



C. gracilis (Slender Cladophora). In rock-pools, and on stones. Firestone Bay. 

 Annual. Spring and summer. 



