288 Scientific Proceedings, Royal Dublin Society. 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, .fee. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Callitliamnion floccosum. 



Spring annual. Fruit in April. 

 Very rare in Firth of Forth. 



Callophyllis laciniata. 

 All the year. 



Capsules in Spring. Granules in 

 Summer. 



Calotlirix confervicola. 

 July to November. ("Summer," 

 Le Jolis.) 



Ceramium rubrum. 



All the year. Fruit, July and 

 August. Often on rocks. 



(Order of frequency of annexed host 

 plants, approximate only.) 



Maugeria sanguinea. Biennial. 



Laminaria digitata. Perennial. 



Ceramium rubrum. All the year. 



„ acanthonotum. Do. 

 „ Deslongchampsii. Do. 



Chordaria flagelliformis. April to 

 November, and later. 



Chorda lomentaria. March to Novem- 

 ber. 



Chondrus crispus. Perennial. 



Cladophora rupestris. All the year. 



Polysiphonia nigrescens. Perennial. 

 ,, elongata. Do. 



Halidrys siliquosa. Do. 



Rhodomela subfusca. Do, 



Chtetopteris plumosa. Do. 



Cladostephus spongiosus. Do. 

 „ distichus. Do. 



Polysiphonia atro-rubescens. All the 

 year. 



Phyllitis CEespitosa. Mar. to Nov 

 Some plants survive the winter. 



Chsetomorpha melagonium. Perennia 



Chorda filum. April to December. 



Laminaria saccharina. Perennial. 

 ,, digitata. Do. 



Saccharhiza bulbosa. Do. 



Rhodomela lycopodioides. Do. 



Rytiphlaja thuyoides. Do. 



Corallina officinalis. Do. 



Asperococcus echinatus. April to 

 October. 



Dumontia filiformls. March to Octo- 

 ber. Many plants survive the winter. 



Cystoclonium purpurascens. April to 

 October, T. (July to October, Le 

 Jolis — Spring, summer. Crouan.) 



Laurencia hybrida. All the year. 



Ptilota elegans. Perennial. 



Fucus vesiculosus. Do. 



,, serratus. Do. 



,, platycarpus. Do. 



Griffithsia setacea. Do,, rarely. 



