Alphabetical List of Parasitical Algm of the Firth of Forth. 297 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, &c. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Urospora pencilliformis. 



Annual. November to August. T. 

 Fruit in Winter and Spring. 

 Usually on rocks near high water. 



TJlva latissima. 



'" At all seasons," Harvey. Usually 

 on rocks. 



Ulva lactuca. 



March to June. T. ("Spring," 

 Crouan. "February to April," 

 Le Jolis.) 



Fucus vesiculosus. Perennial. 

 Callithamnion Rothii, Do. 

 Fucus platy carpus. i)o. 



Cladophora Isetevirens. March to 



December, or later. 

 Cladophora rupestris. All the year. 

 Corallina officinalis. Perennial. 

 Ceramium rubrum. All the year. 

 Cladostephus spongiosus. Perennial. 

 Ptilota elegans. Do. 



Chordaria flagelliformis. April to 



November, and later. 

 Cystoclonium purpurascens. April to 



October. 

 Chsetopteris plumosa. Perennial. 

 Cladostephus distichus. Do. 

 Rhodymenia palmata. Biennial. 

 Fucus serratus. Perennial. 



,, vesiculosus. Do. 



Chondrus crispus. Do. 



Cladophora rupestris. All the year. 



Notes added in the Press. 



Laurencia hybrida. 



All the year. Fruit, granular, in 

 Winter and Spring ; Keramidia in 

 July. Usually on rocks. 



Laurencia pinnatifida. 



All the year. Fruit, granular, in 

 Winter and Spring; Keramida in 

 July. Usually on rocks. 



Fucus serratus. Perennial. Rarely. 



Ceramium strictum. 

 Annual, Spring and 

 Usually on rocks. 



Summer. 



Rhodomela lyeopodioides. 

 Rarely. 



Perennial. 



Cladostephus spongiosus. Perennial. 



ScTEN, Peoc. R.D.S., Vol. hi., Pt. v. 



2a 



