Fig. 31. CHOEDA FILUM. 



Colour. Dark olive-brown. 



Substance. Gristly and very firm when recent; slimy; slipping througli tlie 

 fingers. 



Character of Frond. Perfectly simple. Like long boot-laces; one from each 

 minute disk-like root; growing in large companies, in sandy or muddy 

 bottoms; cylindrical; tapering at both ends^ clothed with pellucid 

 hairs. 



Measurement. From 1 to 20^ or even 40 feet long in deep water. From 

 ^ to J inch in diameter. About as thick as a round slate-pencil. 



Fructification. Minute seeds (siiores) covering the whole surface of the frond. 



Habitat. Our shores generally. From between tide-marks to ten or fifteen 

 fathoms of water. Very abundant. 



What has been considered a small variety, G. fomentosum, is densely covered 

 with olive or green cobweb-like hairs. But Dr. Harvey believes this to be "the 

 case with all the infant plants of this species. 



Fig. 32. CHOEDA LOMENTAEIA. 



Colour. Brownish or yellowish olive. 

 Svhstance. Soft, membranaceous. 



Character of Frond. Perfectly simple. When young, like boot-laces_, each 

 from a minute disk-like root; more delicate in quality than C.filumj 

 cylindrical; tapering at both ends; when full-grown contracted at 

 intervals as if tied in; the intervals inflated. 



Measurement. From 3 to 16 inches long. One-third of an inch in diameter 

 when largest. Often much smaller. 



Fructification. Minute seeds [spores) covering the whole surface of the frond. 



Habitat. Our coasts generally. On rocks and stones between tide-marks. 

 Common. 



16 



