496 Howe: Phycological studies 



coilodesme ? 



La Paz, Vives 18c. 



Poor and fragmentary material, but it seems to be closely 

 related to Coilodesme californica (Rupr.) Kjellm. 



Sargassum ? 



La Paz, Vives i8d. 



A fragment of a plant of the Eusargassum section, with thin 

 linear-lanceolate serrate-ciliate leaves 6-8 cm. long and 7-12 mm. 

 in greatest width; cryptostomata inconspicuous or wanting; leaf 

 margins here and there approaching a biserrate condition. 



Sargassum ? 



La Paz, Vives 1. 



A single plant a meter or more in length, sterile or with very 

 immature receptacles. Resembling Vives i8d, but the lanceolate 

 or linear-lanceolate leaves (2-9 cm. long, 5-14 mm. in greatest 

 width) have much more conspicuous cryptostomata. The texture 

 of the leaves is thin-membranous and the margins are irregularly 

 serrate, the teeth often terminating in soft somewhat cilium-like 

 points. The vesicles are subglobose and muticous, the largest 

 attaining a diameter of 6-8 mm. Both this and 18 d, which is 

 possibly a form of the same thing, are quite different from Sargas- 

 sum Liehmanni J. Ag. and 5. Agardhianum Farl., which, so far 

 as we are aware, are the only two species of Sargassum that have 

 thus far been described from the Pacific coast of North America. 

 The plants suggest broad-leaved forms of S. Filipendula (Ag.) J. 

 Ag., but we are unwilling to refer them to that species and unwilling 

 also, with the material at hand, to propose a new specific name 

 in a genus in which more than two hundred more or less imper- 

 fectly understood species have already been proposed. 



In the herbarium of the New York Botanical Garden (ex herb. 

 C. L. Anderson) are four fragments of a Sargassum from La 

 Paz, Baja California, which have leaves resembling those of Vives 1 

 in form, size, margin, and cryptostomata, but are rather more 

 coriaceous. One of the specimens is accompanied by a long (12 

 cm.) lax leafless panicle of receptacles. The panicle is detached 

 but probably belongs with the accompanying stem and leaves. 



