178 Collins and Howe: Species of Halymenia 



corticali cellularum minorum 2-6 series monstrante, celluHs super- 

 ficialibus aetate elongatis, obconicis vel clavato-truncatis, denique 

 diametro plerumque 2-5-plo longioribus, parietibus externalibus 

 gelatinosis, deliquescentibus; tetrasporangiis decussatim divisis; 

 cystocarpiis ignotis. 



Ab H. Floresia (Clem.) Ag. et H. Gelinaria Collins & Howe 

 differt colore magis saturate rubro vel violaceo-rubro, fronde 

 denique firmiore, subcoriacea, nonnunquam verruculosa, cellulis 

 terminalibus filorum corticalium clavato-truncatis. Frons H. 

 pseudofloresiae magis divisa est quam H. Gelinariae, minus et 

 minus regulariter quam H. Floresiae. 



Ad oras Insularum Bermudensium (typum legit A. B. Hervey, 



Jan. 15, 1915). 



Thallus short-stipitate; stipe* 5-10 mm. long, 1-2 mm. thick, 

 cuneate from a subterete base; frond membranous and gelatinous 

 in younger parts, becoming firmer and subcoriaceous with age, 

 50-450 At thick, suborbicular, ovate, cuneate-obovate, or commonly 

 very irregular in general outline, attaining a length of 7-30 cm., 

 deeply, irregularly, or subpalmately lobed, or often showing 

 cuneate-based substipitate marginal proliferations, the main 

 expansions or axes 1-8 cm. broad, the lobes or proliferations com- 

 monly lanceolate, serrate, biserrate, or subpinnately lobulate or 

 bilobulate, the teeth mostly acuminate-deltoid; surface dull, 

 mostly smooth, but often becoming rugose and minutely and 

 copiously verruculose with age; color (when dried) daphne-red, 

 becoming deep hellebore-red or neutral redf in old fronds; medulla 

 of stipe 0.75-1.0 mm. thick, moderately compact; cortex of stipe 

 rather firm, subparenchymatous, mostly 20-40 cells thick; medulla 

 of frond mostly rather loose or subvacuous, its filaments 10-16 /i 

 in diameter, many of them obliquely transverse, connecting the 

 opposite subcortical layers, the cells 25-90 m long, the medulla 

 or inner subcortex occasionally showing a few inconspicuous stel- 

 late ganglia with nodes 20-40 ^u in diameter and slender long- 

 celled branches 2-5 /i in diameter; cortex and subcortex rather 

 firm and solid, obscurely filamentous; cells of subcortex ellipsoidal, 

 mostly 20-50 IX in diameter, obscurely anastomosing or concate- 

 nate; cortex 2-6 cells thick, the superficial cells (protoplasts) 

 4-13 IX in diameter in surface view, angular, obtuse, subisodia- 

 metric or often broader than high in younger parts, becoming 

 columnar, obtuse, acute, or acuminate, and finally, for the most 



* A well-developed original stipe has been seen in only one case, 

 t Ridgway, loc. cit., pi. 38. 



