156 PRELIMINARY REPORT UPON THE 



E. spharophorus (Warted Ectocaipus). Parasitical on Fuci, at half-tide mark. 



Mewstone ; Bovisand. Annual. Summer. Rare. 

 E. brachiatus (Cross-branched Ectocarpus). Parasitical on Rhodymenia palrnata. 



Firestone Bay. Annual. Summer. 

 E. Mertensii (Mei tens' Ectocarpus). In pools and on sand-covered rocks. Mount 



Edgcumbe; Whitsand Bay. April and May. 

 E. longifructus (Long-fruited Ectocarpus. On rocks. Hoe. Annual, Summer, 



Rare. 

 Myriotrichia clavceformis (Club-shaped Myriotrichia). Parasitical on Chorda 



lomentaria. Annual. Summer. 

 M. filiformis (Thread-like Myriotrichia). Parasitical on Chorda lomentaria. 



Annual. Summer. 



Sub-Glass II. — Rhodosperme^ or Ceramiales. 

 (Red or Brown Seaweeds.) 



Order VII. Bhodomelaceas. 



Rhodomela subfusca (Brownish Rhodoraela). Common on rocks and shells between 



tide-marks. Perennial. Spring and summer. 

 Bostrychia scorpioides (Scorpioid Bostrychia). Hollows of sea-walls. Trevol ; 



Pom fleet. 

 Rytiphlcea pinastroides (Pine Rytiphlfea). On rocks, low-water mark. Whitsand 



Bay. Perennial. Autumn and winter. 

 R. thuyoides (Cypress Rytiphlfea). In tide-pools, and on corallines and flat rocks. 



Annual. Summer. 

 R, fruticulosa (Shrubby Rytiphlaea). In tide-pools, and on corallines. Mount 



Batten ; Bovisand. Perennial. Summer. 

 R. complanata (Compressed or flattish Rytiphlaea). On rocks at low-water mark. 



Bovisand. 

 Polysiphonia urceolata (Pitchered Polysiphonia). Very common on rocks, stones, 



and in pools. Annual. Spring and summer. 

 P. ybrmosa (Beautiful Polysiphonia). In tide-pools, on stones. Torpoint. Annual. 



Summer. 

 P. pulminata (Cushioned Polysiphonia). On rocks between tide-marks. Hoe j 



Whitsand Bay. Annual. Summer. 

 P. fibrata (Fibred Polysiphonia). On rocks, and in tide-pools. Mount Batten. 



Annual. Summer and autumn. 

 P. elongella (Divaricate Polysiphonia). On rocks, stones, and small algae. Mount 



Edgcumbe. Biennial. Spring and summer. 

 P. elongata (Lobster-horn Polysiphonia). On rocks and shells, in tide-pools and 



deep water. Mount Batten; Mount Edgcumbe ; Torpoint. Perennial. Spring 



and summer. 

 P. violacea (Violet Polysiphonia). On rocks and stones, low-water mark. Mount 



Edgcumbe ; Bovisand. Annual. May and June. 

 P. fibrillosa (Fibrillose Polysiphonia). On rocks and stones, low-water mark. 



Mount Batten; Whitsand Bay. Annual. Summer. 

 P. Brodicei (Brodie's Polysiphonia). On rocks, and in pools. Corbeal; Torpoint. 

 P. variegata (Variegated Polysiphonia). On mud-covered rocks. Beggar's Island ; 



Torpoint. 

 P. simulans (Deceptive Polysiphonia). On rocks, and in tide-pools, low- water 



mark. Bovisand. 

 P. nigrescens (Blackish Polysiphonia). Common at half-tide mark. Perennial. 



Spring and summer. 

 P. atro-rubescens (Dark-red Polysiphonia). In pools, and on stones. Common. 



Annual. Spring and summer. 

 P. fastiyiata (Level-topped Polysiphonia). On Fuci. Perennial. Summer and 



winter. 



