Collins and Howe: Species of Halymenia 181 



multum majoribus, magis echinato-stellatis, cum processubus 

 subspinescentibus saepe permultis. 



Ad oras Insularum Bermudensium, in profundis (typo in herb. 

 Hort. Reg, Kew., a Exped. "Challenger" lecto et " Kallymenia 

 reniformis" denominato). 



Frond membranous, gelatinous, 125-200 f^ thick (when soaked 

 out), suborbicular in general outline, attaining width of 10-18 

 cm., deeply, irregularly or subpalmately lobed or divided, the 

 lobes irregularly obovate or suborbicular, mostly 2-6 cm. broad, 

 their margins sinuate- or erose-dentate or sparingly sublobulate; 

 surface dull; color (dried) light grayish vinaceous to Persian lilac;* 

 medulla of frond subvacuous or loosely filamentous, its filaments 

 homogeneous, mostly 10-14 M in diameter (including gelatinous 

 walls; protoplasts commonly only 1-4 fx); cortex of frond gela- 

 tinous, translucent, submonostromatic, the superficial cells 

 (protoplasts) ovoid, subglobose, or ellipsoid, 4-8 jj, in maximum 

 diameter, widely spaced (separated 5-10 m), their longer axes 

 horizontal or vertical, their outer walls ("surface jelly") 10-18 n 

 thick; subcortex of 2-4 layers of closely anastomosing, ovoid, 

 ellipsoid, or often flattened, thick- walled cells, the outer (proto- 

 plasts) granular, 6-10 n in diameter, the inner mostly 25-65 fj, in 

 maximum diameter, some of the inner cells larger, subglobose, 

 80-180 ju in diameter, echinate-stelliform, projecting into the 

 medullary cavity and showing when detached 15-40 rather rigid 

 subspinescent processes, these mostly 25-60 // long and 10-20 /i 

 in diameter at base; other parts unknown. 



Bermuda: Dredged in "31 fathoms, off Bermuda" by members 

 of the Challenger Expedition in 1873, and reported as "Kallymenia 

 reniformis J. G. Agardh " (Rep. Voy. Challenger, Bot. i : Bermudas 

 117. 1884). This is the only specimen known to the present 

 writers. 



Type: In the herbarium of the Royal Botanic Gardens, Kew, 

 England. 



Halymenia echinophysa appears to find its nearest ally in 

 H. actinophysa M. A. Howe,t from La Paz, Lower California, but 

 differs in the smaller, thicker, more lobed, non-nitent thallus, 

 with the surface jelly twice as thick, the surface cells twice as 

 widely spaced, the medullary filaments one half as stout, in the 

 less regularly and less obviously capitate terminations of these 



* Ridgway, loc. cit. pi. 38, 30. 



t Bull. Torrey Club 38: 509. j^/. 54. 1911. 



