Alphabetical List of Parasitical Algce of the Firth of Forth. 287 



Parasites 



alphabetically arranged, with periods 

 duration, times of fructification, &c. 



of 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Callithamnion Hookeri. 



March to October. Fruit in Spring 

 and Summer. Sometimes on 

 rocks. 



Callithamnion polyspermum. 



February to October. Fruit, April 

 to August. T. (" Spring," 

 Crouan. " March—May," Le 

 Jolts. " Summer," S. O. Gray.) 

 Sometimes on rocks. 



Callithamnion roseum. 



March to October. Fruit, May to 

 August. Sometimes on rocks. 



Callithamnion Borreri. 



All the year. 



August. 



Fruit April to 



Callithamnion Turneri. 

 May to September. Fruit in Sum ' 

 mer. 



Callithamnion secundatum. Ag. : 



May to September. Fruit in Sum- 

 mer. 



Callithamnion sparsum. 

 Summer, Autumn. 



Callithamnion arbuscula. 

 Perennial. Fruit April to August. 

 Usually on rocks. 



Cladostephus spongiosus. Perennial. 

 Ptilota elegans. Do. 



Cladophora rupestris. All the year. 

 Chondrus crispus. Perennial. 



Fucus vesiculosus. Do. 



Rhodomela lycopodioides. Do, 



( Lauren cia hybrida, rarely. All the 

 J year. "Fruit Winter and Spring." 



j Crouan. " Keramidia, July," 



[^ Cresswell. 



Polysiphonia nigrescens, rarely. Per- 

 ennial. 

 Delesseria alata, rarely. All the year. 



Polysiphonia fastigiata. Perennial. 

 Cladophora rupestris. All the year. 

 Ceramium rubrum, rarely. Do. 



,, acanthonotum, rarely. All 



the year. 

 Ceramium Deslongchampsii, rarely. 



All the year 



Polysiphonia fastigiata. Perennial. 

 Cladostephus spongiosus. Do. 



,, distichus, rarely. Do. 



Polysiphonia nigrescens, ,, Do. 



Chondrus crispus. Perennial. 



Ptilota elegans. Do. 



Cladostephus spongiosus. Do. 



Polysiphonia fastigiata. Do. 

 Gigartina mamillosa, rarely. Do. 



Callitham. arbuscula, „ Do. 



Polysiphonia nigrescens „ Do. 



Polyides lumbricalis. Perennial. 

 Furcellaria fastigiata. Do. 

 Phyllophora Broditei. Do, 



Rhodymenia palmata. Biennial. 

 Porphyra laciniata. All the year. 

 Sphacelaria radicans, rarely. Peren- 

 nial. 



Laminaria digitata. Perennial. 



Ptilota elegans, rarely. Perennial. 



