418 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



mous ; a great part of the ramuli sub-navicular, the rest cylin- 

 drical ; the former generally in 3 ranks, the latter distichous 

 and opposite, or multiseriate ; length up to twice the diameter 

 of the axis. Axis without naked base or with a very short one. 



Forma ELEGANS (Crouan) Weber, 1898, p. 336; Vickers, 

 1908, p. 27, PI. XLIIIb. Frond dichotomoiis, ramuli nearly 

 all cylindrical, only a few at the base sub-navicular ; length up 

 to 6 times, usually 3 or 4 times the diameter of the axis ; 

 distichous and opposite. 



Forma INTERMEDIA Weber, 1898, p. 337. Frond very lux- 

 uriant, up to 30 cm. high ; ramuli all, except those of the base, 

 cylindrical, in two or more series; base naked fora longer or 

 shorter distance. 



Forma TYPICA Weber, 1898, p. 337 ; Vickers, 1908, p. 27, 

 PL XLJII. Frond lower than in the preceding forms, simple 

 or branched ; ramuli always multiseriate, cylindrical except 

 those at the base, length up to 4 times the diameter of the axis. 



All four of these forms at Guadeloupe, among the Maze and 

 Schramm exsiccatae, under various names ; some also at Barba- 

 dos ; forma alternifolia at Fla. 



Var. DISTICHA Weber, 1898, p. 338. Frond often much 

 branched, base naked ; ramuli all except the lowest cylindrical 

 and opposite in two ranks, except occasionally multiseriate near 

 the summit ; ramuli erecto-patent, up to twice the diameter of 

 the axis. Fla., W. I. 



13. C. PASPALOIDES (Bory) Harvey, 1858, p. 21 ; Weber, 

 1898, p. 350, PI. XXX ; Alg. Am.-Bor., No. 38. Stolon ro- 

 bust, up to 4 mm. diam.; frond of a naked stipe (or pedicel), 

 simple or dichotomous, bearing at its summit simple, dichoto- 

 mous, or palmate branches, covered with ramuli ; ramuli in 3 

 or 4 alternating ranks, subverticillate or inclined to right and 

 left, with bases in contact, imbricate or distinct, pinnate ; pin- 

 nules inclined to one side, bases adjacent or opposite, simple, 

 forked, or again pinnate, pinnules almost always mucronate. 



A species of very characteristic habit, better recognized from 

 specimen or plate than from description ; it is limited to Florida, 

 the West Indies, Gulf of Mexico and Carribbean Sea ; includ- 

 ing three varieties and a number of forms, not clear from each 

 other, but not likely to be mistaken for any other species when 

 one has a clear idea of the type. 



curved upwards, cylindrical, 3-4 times as long as the width of the rachis. 

 He considers it a form of shallow lagoons. 



