Marine Algce of the Dimhar Coast 289 



95. Callithanmion polyspermum, Ag. 



On shaded vertical rocks, often in muddy places, at about half- 

 tide level ; also epiphytic on Polysijjlwnia fastigiata, CIcuhphora 

 rupestris, Gigartlna mamiUosa, and other small Algte. Always at 

 places which are left uncovered by the tide for several hours daily. 

 Annual. INIarch to October. Fruit in May, June, and July. Spores 

 usually escape towards the end of July. 



GRIFFITHSIA, Ag. 



96. Griffithsia coraUina (Liun.), Ag. 



On rocks at low- water mark, and at a greater depth ; also epiphytic 

 on Algae, always submerged. Annual. Fruit in summer. 



97. Griffithsia setacea (Ellis), Ag. 



In deep, shaded pools between tide marks ; on the perpendicular 

 sides of exposed rocks in the shade near low-water mark ; also in 

 deep water. Sometimes in very fine specimens. Perennial. Fruit 

 in April, May, and June. 



PTILOTA, Ag. 



98. Ptilota elegans, Bonnem. [Ptilota sericea, Kiitz.) 



On shaded rocks, and in dark crevices, from a little below half- 

 tide level to low-water mark. Usually left uncovered by the tide, 

 in the shade, for some hours daily. Perennial. Fruit in spring 

 and summer. Very fine on rocks east of the " Vault," Broxmouth. 



99. Ptilota pliunosa (Linn.), Ag. 



Epiphytic on Lamlnaria hyperhorea in deep water. Perennial. 

 Fruit in spring and summer, so far as my experience goes ; but Mr 

 Batters finds fruit nearly all the year at Berwick. Fine and very 

 common. 



CERAMIXJM, Lyngb. 



100. Ceramium acanthonotum, Carm. 



Common on rocks in the shade from about half-tide level to low- 

 water mark. All the year. Fruit in winter and spring. Epiphytic 

 on the following Algis : Ptilota elegan-s, Cladostejjhus spongiusus, 

 Callithamnion arhuscula, Polysiphonia hyssoides, &c. 



101. Ceramiimi Deslongcliampsu, Chauv. 



On rocks between tide marks, generally in pools ; also epiphytic 

 on Algfe. All the year. Fruit in Julj', August, and September, 

 Host plants : Ptilota elegans, Cladophora rupjestris, ClaAosteplius 

 spongiosus, Chondrus crispics, Corallina officinalis, Polysiphonia 

 nigrescens. 



102. Ceramium diaphantun (Lightf. ), Roth. 



On rocks, and epiphytic on small Algje, in pools between tide 

 marks. Annual. March to September. Fruit in July and August. 

 Host plants: Halidrys siliquosa, Polysiphonia nigrescens, Clado- 

 stephtis spongiosus, Polysiphonia Jihrillosa, k,c. 



TRANS. BOX, SOC. VOL, XVIII. 2 K 



