NO. 1 1 MARINE ALGAE AND MARINE SPERMATOPHYTES — HOWE 3 



sheaths with occasional flexuous or contorted Hving filaments and 

 inclusions of foreign algae and varied detritus ; filaments of the 

 superficial lamella crowded, usually flexuous or contorted, occa- 

 sionally rather strict and suberect ; vaginae close, mostly incon- 

 spicuous, not affected by chlor-zinc-iodine ; trichomata pale olivace- 

 ous, 1. 5-1. 8 fi thick, not constricted at the septa, the apex straight, not 

 attenuate ; cells 2-6 times as long as broad, 3-9 /x long, the apical 

 rounded, calyptra none. 



On reef at Cayo Hutia,^ Cuba, Tomas Barrera Expedition (Hen- 

 derson & Bartsch 103, May 14, 1914). Types in herb. U. S. Nat. 

 Museum and in herb. N. Y. Botanical Garden. 



Phormidinin Hendersonii is a close relative of the Hawaiian 

 Phormidium Crosbyanum Tilden (Am. Alg. 645. 1909; Minnesota 



Phormidium Hendersonii M. A. Howe. Photograph of formalin-preserved materi- 

 al, natural size. The right-hand figure shows the type-specimen from Cayo Hutia 

 (Henderson S" Bartsch \03), viewed from above; the left-hand figure shows a speci- 

 men from the mouth of (^uanica Harbor, Porto Rico (Howe 6999), viewed from below; 

 the middle figure shows a vertical section through a disc from Cayo Don Luis, Porto 

 Rico (Howe 7192). 



Alg. 96. pi. 4. f. 60, 61. 1910) but seems to differ in the more rigid- 

 cartilaginous, more distinctly lamellate cushions, and the longer, less 

 distinctly defined cells, which average about 5.6 fx long, while those of 

 P. Crosbyanum average about 3.3 /x long. Being fleshy-cartilaginous 

 and often decolorate, it is slightly suggestive of the base of a sea- 

 anemone or other actinarian, and is probably sometimes neglected 

 by the botanical collector as not pertaining to his field of action. The 



* Often spelled " Julias " on Cuban maps. 



