290 ScientifiG Proceedings, Royal Dublin Society. 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, &c. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Chylocladia articulata. 

 April to October. Fruit in Summer. 

 Nearly always on rocks. 



Chylocladia clavellosa. 

 April to October. Fruit in Summer. 

 Nearly always on rocks. 



Cladophora laetevirens. 

 March to December, or later. 

 Usually on rocks. 



Cladophora lanosa. 



April to August. 

 Crouan.) 



T. (" Spring," 



Cladophora rupestris. 

 All the year. Usually on rocks. 



ChEetomorpha melagonium. 

 Perennial. Fruit in Summer. 

 Usually on rocks. 



Chaetomorpha tortuosa. 

 May to October ; but plants some- 

 times survive the winter. 



Corallina officinalis. 

 Perennial. Fruit, Winter and Spring. 



Chorda lomentaria. 

 March to November. Tricho- 

 sporangia. July and August. 

 Usually on rocks. 



Dasya coccinea. 



May to October. Fruit, July, Au- 

 gust. Usually on rocks and 

 acorn shells. 



Delesseria alata. 



All the year. Fruit in Spring. 

 Often on rocks. 



Laminaria digitata, rarely. Perennial. 

 Fucus serratus, ,, Do. 



„ vesiculosus, ,, Do. 



Polyides lumbricalis, rarely. Peren- 

 nial. 

 Furcellaria fastlgiata, ,, Perennial. 



Cladophora rupestris. All the year. 

 Chondrus crispus. Perennial. 



Pol. nigrescens. Do. 



Ptilota elegans, rarely. Do. 



Lam. saccharina, ,, Do. 



Corallina officinalis, rarely. Do. 

 Cladostephus spongiosus, rarely. Per- 

 ennial. 



Polyides lumbricalis. Perennial. 

 Ceramium rubrum. All the year, 

 Halidrys siliquosa. Perennial, 

 Furcellaria f astigiata. Do. 



Corallina officinalis. Perennial. 

 Ptilota elegans, rarely. Do. 



Corallina officinalis. Perennial. 



Corallina officinalis. Perennial. 

 Chondrus crispus. Do. 



Himanthalia lorea (fronds). Peren- 

 nial. 



Cladophora rupestris. All the year. 

 Corallina officinalis, rarely. Perennial. 

 Polysiphonia fibrillosa, rarely. Per- 

 ennial. 



Laminaria digitata. P^erennial. 



Lam. digitata. Perennial. 



Sacchariza bulbosa. Do. 



Rhodomela lycopodioides. Do. 

 Ptilota elegans. Do. 



„ plumosa. ' Do. 



