174 COLLINS AND Howe: Species oF HALYMENIA 
simplice vel parce subconformiter divisa, margine plana, integra 
vel irregulariter dentata aut crenulata, nonnunquam fimbriata; 
medulla frondis laxa vel subvacua, filamentis transversalibus 
crebris, filis stellatis paucis et inconspicuis; strato subcorticali 
dense filamentoso, filamentis anastomosantibus, cellulis nodalibus » 
majoribus; strato corticali series 1-4 cellularum monstrante, 
parietibus cellularum mollissimis, gelatinoso-deliquescentibus; 
tetrasporangiis decussatim divisis; cystocarpiis numerosis, minutis, 
ad una pagina frondis plerumque prominulis, massa sporarum 
m. 
. 
turbinata, 120-140 p dia 
Species colore, habitu, cystocarpiorum forma, H. floridanae 
J. Ag. proxima, sed differt thallo multo magis gelatinoso, plerum- 
que crassiore, cortice manifeste filamentoso, nec pseudoparen- 
chymato, filis stellatis minus evolutis. Structura H. Floresiae 
(Clem.) Ag. similis, habitu differt, fronde latiore integra vel sub- 
integra, nec regulariter pinnata. ‘ 
Ad oras Floridae et Carolinae Septentrionalis (typum legit 
M. A. Howe in loco “Jupiter Inlet” dicto ad oras Floridae, Oct, 
13, 1902, no. 1252). 
Thallus short-stipitate from a small basal disk; stipe 3-5 mm. 
long, 0.75-1.2 mm. thick, cuneate from a subterete base;frond plane, 
membranous or carnose-membranous, usually very gelatinous, 
60-600* 4 thick, suborbicular, oblong, ovate, or cuneate-obovate, 
attaining a width of 5 cm. to 6 dm., subentire or rather sparingly 
(usually conformably) parted, lobed, or proliferous, the margims 
entire or very irregularly lobulate, dentate, erose-crenulate, OF 
occasionally laciniate-fimbriate; surface dull, smooth; color 
pinkish vinaceous, rocellin-purple, vinaceous purple, or deep 
hellebore-red;} medulla of stipe 0.45~0.75 mm. thick, moderately 
compact, gelatinous; cortex of stipe gelatinous, mostly 8-15 cells 
thick; medulla of frond moderately compact or subvacuous, 1t 
* The minimum is drawn from the thinner parts of dried specimens, as mses 
when sections are soaked out with water; the maximum is from the older parts a9 
shown in formalin-preserved material. 
t Ridgway, loc. cit. pl. 27 and 38. 
