Alphabetical List of Parasitical Algce of the Firth of Forth. 291 



Parasites 



alphabetically arranged, with periods of 

 duration, times of fructification, &c. 



Host Plants 



in the order of frequency, with periods 

 of duration. 



Delesseria sinuosa. 



Biennial. Fruit in Winter. Often 

 on rocks. Always submerged. 



Delesseria hypoglossum. 



" Summer annual." Harvey. 



Very rare in Firth of Forth. 



Dermocarpa prasina. 

 Found as yet only in January in 

 the Firth of Forth. 



Dictyosiphon fceniculaceus, subspecies 

 hispidus of Kjellman. 



April to August. Sporangia escape 

 in July and August. T. 



Dictyosiphon fceniculaceus, subspecies 

 flaccidus of Kjellman. 

 April to August. Sporangia escape 

 end of July. T. 



Dictyosiphon hippuroides. Aresch. 

 Chordaria hippuroides. Agardh. 

 May to September. Sporangia 

 escape end of July and beginning 

 of August. T. 



Ectocarpus granulosus. 



April to October. Fruit, May to 

 September. Usually on rocks. 

 Always submerged. 



Ectocarpus sphserophorus. 

 April to September. Almost al- 

 ways in fruit. 



Lam. digitata. 

 Sacchariza bulbosa. 

 Odonthalia dentata. 

 Ptilota plumosa. 



Perennial. 

 Do. 

 Do. 

 Do. 



Odonthalia dentata, rarely. Peren- 

 nial. 



Catenella opuntia. Perennial. 



Chorda lomentaria. March to No- 

 vember. 



Chondrus crispus. Perennial. 



Phyllitis caespitosa and debilis. 

 March to November, and later. 



Fucus vesiculosus. Perennial. 



Halidrys siliquosa, rarely. Perennial. 



Gigartina mamillosa do. 



Phlsospora tortilis. March to Sep- 

 tember. 



Chordaria flagelliformis, rarely. April 

 to November, and later. 



Chordaria flagelliformis. April to 

 November, and later. 



Ceramium rubrum. All the year 



Ptilota elegans. Perennial. 



Callitham. polyspermum. February 

 to October. 



Cladophora rupestris. AU the year. 



Callitham. arbuscula. Perennial. 

 ,, Hookeri. March to Octo- 



ber 



