344 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



Ckamer, they occur upon the midrib of the thallus. They are spherical 

 of shape about 460 jli broad. Cramer maintains that the cystocarps 

 occur upon the underside of the thalhis. This I have not been able 

 to verify in my material, the small pieces found with cystocarps 

 being without rhizoids. 



As mentioned above this species occurs upon the roots of the 

 mangroves under whose shade it is able to grow, even some- 

 what above the suiface of the sea. Like several Bostrychia-sipecies 

 it otten lives, too, in brackish and dirty water. According to Harvey it 

 is even found in rivers in Georgia and Florida and M. A. Howe*) 

 came across this plant in a mountain stream in Porto Rico. The lo- 

 cality was about 12 kilometers from the sea and the elevation about 

 400 to 500 meters. Zanardini, Goebel and Karsten have described 

 related species from Borneo, Zanzibar and the island of Amboina 

 all living in fresh water. 



This species lias been found at St. Croix: Cliristianssted's Lagoon, 

 Salt River Lagoon. 



Geogr. Distrib.: Seems to be widely distributed in warmer seas. 



Subfam. 2. Delesserieæ. 

 Delesseria Lamour. 



1. Delesseria tenuifolia Harv. 



Harvey, W. H., Nereis Bor. -Am., II, p. 97, pi. XXII, B. Kützing, F.. 

 Tab. Phycol., vol. XIX, tab. 13, figs, d, e, f. Agardh, J., Epicrisis, p. 488. 



Hypoglossum tenuifolium J. Agardh, Spec. Alg., vol. 3, pars 3, 1898, 

 p. 186. Børgesen, F., Some new or little known West Indian Florideæ. 

 II, p. 198. 



This fine, delicate plant (Fig. 340) forms dense bushes up to ten 

 cm or even more. When alive it mostly had a bright yellow-greenish 

 colour, but when dried it got a reddish tinge. It has a shorter or 

 longer basal stem up to 1 cm long, from which the densely ramified 

 often nearly globular, thallus arises. The stem consists of the first 

 developed leaf of the young plant, whose cells have grown large 

 with thick walls, but this has further been strengthened by means 

 of a parenchymatous tissue, forming on both sides of it a semicircular 

 tissue (cp. Fig. 341 a). 



*) Howe, M. A., Caloglossa Leprieurii in mountain streams (Torreya, voL 

 2, 1902, p. 149). 



