Alphabetical List of Parasitical AlgcB of the Firth of Forth. 295 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, &c. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Nitophyllum laceratum. 

 May to September. Fruit in July. 



Nitophyllum punctatum. 



May to September. Fruit in Sum- 

 mer. 

 *Maugeria Sanguinea. 



Biennial. Fruit in Winter. 



*PIocamium coccineum. 



Perennial. Fruit, June and July. 

 Usually on rocks in deep water. 



Polysiphonia urceolata. 



March to October. Some plants 

 survive Winter. ("Fruit, Spring," 

 Le Jolis and Crouan). Nearly 

 always on rocks. 



Polysiphonia fibrillosa. 



Perennial. Fruit, July to Sep- 

 tember. Nearly always on rocks. 



Polysiphonia fibrata. 



Summer and Autumn. Fruit, 

 August. Nearly always on rocks. 



Polysiphonia nigrescens. 



Perennial. Fruit in Summer. 

 Nearly always on rocks. 



Polysiphonia fastigiata. 



Perennial. Fruit, June to Sep- 

 tember. Occurs on rocks at 

 Broxmouth. 



Polysiphonia parasitica. 



June to September. Tetraspores, 

 July and August. Usually on 

 rocks near low water, 



*Phyllitis csespitosa. 

 March to November. Some plants 

 survive the Winter. 



Trichosporangia in Spring and Sum- 

 mer. 



Laminaria digitata. Perennial. 



Desmarestia aculeata(old). Perennial. 



Ptilota plumosa, rarely. Perennial. 



Laminaria digitata. Perennial. 



Rhodomela lycopodioides. Do. 

 Polyides lumbricalis. Do. 



Odonthalia dentata, rarely. Do. 



Cladophora uncialis, rarely. 



From Spring one year until Summer 

 the next — at Dunbar, &c. 

 Laminaria digitata. Perennial. 



Cladostephus spongiosus. Perennial. 



Corallina officinalis. Perennial. 



Corallina officinalis. Perennial. 



Fucus nodosus. Perennial. 



Ptilota plumosa, very rarely. Peren- 

 nial. 



Fucus vesiculosus, very rarely. Per- 

 ennial. 



