278 Mr George Traill 07i the 



RHIZOCLONIUM, Kiitz. 



21. Rhizoclonium riparium (Roth), liar v. 



On sand-covered rocks, and sometimes epiphytic on Fuci, near 

 high-water mark. Occasionally forms widely spreading strata at 

 quiet, flat, muddy, or sandy places near high-water mark. Left un- 

 covered by the tide, and exposed to the light for many hours daily. 

 All the year. At many places, but usually very fine a little to the 

 west of the ladies' bathing pool ; also at the east of the esplanade. 



CLADOPHORA, Kiitz. 



22. Cladophora albida, var. rcfrada (Harv.), Thur. 



In pools near low-water mark west of the " Vault," Broxmouth 

 Point. Rather rare. Annual. Summer. 



23. Cladophora arcta (Dill w.), Kiitz. 



In pools near low-water mark, fine and common, especially in 

 the vicinity of the " Vault." Annual. March to October. 



24. Cladophora arctiusciila, Ciouan. 



On exposed rocks near high-water mark. All the year. In best 

 condition from March to October. Fruit in spring. Eot common. 



25. Cladophora Isetevirens (Dill w.), Kiitz. 



On rocks, and epiphytic on Algae, in pools usually at about half- 

 tide level. Always submerged. Annual. March to December. 

 Plants sometimes last through the winter. Fruit in summer. 

 Young plants, and new shoots on plants of the last season, have 

 their ramelli secund ; all the ramelli being produced on the inner 

 side of the ramulus previously to those on the outer side. Host 

 plants : Cladophora rupestris, Chondrus crisjous, Poli/siphonia 

 nigrescens, Corallina officinalis, &e. 



26. Cladophora lanosa (Rotli), Kiitz. 



Epiphytic on Polyides rotundas, Ahnfeldtia plicata, Ceramium 

 ridirum, Furcellaria fastigiata, Halidrys siliquosa, and other 

 small Algae, near low-water mark. Annual. Spring to end of 

 autumn. 



27. Cladophora lanosa, var. uncialis (Haw.), Thur. 



On flat rocks and large stones near low-water mark. Annual. 

 From about March to end of autumn • some of the plants 

 apparently lasting through the winter. In best condition in July. 

 Old plants lose their gloss, and become lighter in colour, and ropy. 

 Abundant at the "Vault." 



28. Cladophora rupestris (Linn.), Kiitz. 



Common and very fine on rocks between tide marks, and at a 

 lower level, Rarely epiphytic on Algae. All the year. Fruit in 

 summer. 



