Plate XX. 



Fig. 85. ECTOCARPUS AMPHIBIUS. 



Colour. Pale-olive. 

 Substance. Soft. 



Character of Frond. Short tnfts of very slender, jointed threads {filaments). Fila- 

 ments branched. Branching partly forked {suhdicliotomous) ; the ultimate 

 branches alternate, on each side a stem. 



Measurement. From 2 to 3 inches long. 



Fructification. In pod-like formations (silicules') ; external; borne on the branchlets. 



Silicules scattered} without stalks (sessile); long; narrow; almost spine-like. 

 Sahitat. In muddy ditches of brackish water near the coast. 



Dr. Harvey considers it possible that this may be but a brackish- water 

 variety of E. siliculosus. 



Fig. 86. ECTOCARPUS FENESTRATUS. 



Colour. Pale green. 

 Substance. Soft. 



Character of Frond. Small tufts of jointed threads {filaments). Filaments branched, 

 but not much so. Branches distant; alternate, on each side a stem; re- 

 branched with a few long, simple, alternate branchlets. 



Measurement. From 1 to 2 inches long. 



Fructification. In pod-like formations {silicules)-, external; scattered plentifully along 

 the branchlets. Silicules dark-brown; narrow-oblong; stalked; densely marked 

 with lines across {transverselt/ striate), and cross-barred. 



Habitat. Salcombe. (Mrs. Wyatt, once!) 



This plant should be looked for further. The shape of its silicules distin- 

 guishes it from B. siliculosus, and its general character and growth from F. 

 tomentosus. 



Fig. 87. ECTOCARPUS DISTORTUS. 



Colour. Dark-brown. 



Substance. Soft; tender; soon decomposing; extremely brittle if remoistened after 

 being dried. 



Character of Frond. Large, densely matted tufts of jointed threads {filaments). 

 Filaments very much branched; bent here and there in a zigzag manner, as 

 if distorted. Branches long; spreading at wide angles; beset with short, thorn- 

 like, but blunt branchlets; either wide-spread {patent); horizontal; or bent 

 backward {re-ctcrved). 



Measurement. Tufts from 4 to 8 inches long. 



Fructification. External seeds {spores) borne on the branches; more or less oval; 



dark-brown; unstalked {sessile), or but slightly stalked. 

 Habitat. Appin. On the shore. Parasitic on Zostera marina. Rare. 

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