Alphabetical List of Parasitical Algce of the Firth of Forth. 289 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, &c. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Ceramium rubrum — continued. 



Ceramium diaphanum. 



March to September, 

 and August. 



Fruit, July 



Ceramium' decurrens. 



June to September, 

 and August. 



Fruit, July 



Ceramium Deslongchampsii. 



All the year. Fruit, August and 

 September, T. ("May, June," 

 Le Jolts.) Often on rocks. 



Ceramium acanthonotum. 



All the year. T. (Fruit, "Winter 

 and Spring," (Ze Jolis and 

 Crouan.) Usually on rocks. 



Chordaria flagelliformis. 



April to November, and later. Fruit 

 in Summer. Nearly always on 

 rocks. 



Phyllophora membranifolia. Peren- 

 nial, rarely. 



Cladophora lastevirens. March to 

 December, or later. 



Gloiosiphonia capillaris. June to Sep- 

 tember, rarely. 



Halidrys siliquosa. Perennial. 



Polysiphonia nigrescens. Do. 

 Cladostephus spongiosus. Do. 

 Asperococcus echinatus. April to 



October. 

 Chordaria flagelliformis. April to 



November, and later. 

 Phyllitis fascia. March to November. 

 Cladostephus distichus. Perennial. 

 Fucus ceranoides, rarely. Do. 

 Gloiosiphonia capillaris, rarely. June 



to September. 

 Polysiphonia fibrillosa, rarely. Peren 



nial. 



Halidrys siliquosa. Perennial. 



Ptilota elegans. Perennial. 



Cladophora rupestris. All the year. 



Cladostephus spongiosus. Perennial. 



Chondrus crispus. Do. 



Corallina officinalis. Do. 



Polysiphonia nigrescens. Do. 



Laurencia hybrida, rarely. All the 

 year. 



Cladostephus distichus, rarely. Peren- 

 nial. 



Callithamnion Borreri, rarely. All the 

 year. 



Halidrys siliquosa, rarely. Perennial. 



Ptilota elegans. Perennial. 



Cladostephus distichus. Do. 



„ spongiosus. Do. 



Chondrus crispus, rarely. Do. 



Gigartina mamillosa, rarely. Do. 



Corallina officinalis. Perennial. 



