170 COLLINS AND HowE: SPECIES OF HALYMENIA 
Ad oras Insularum Bermudensium (typum legit F. S. Collins, 
Apr. 25, 1912, no. 7074). 
Thallus seat stipitate; stipe commonly 2-10 mm. long, 
0.45-0.75 mm. thick, subterete below, complanate or costate- 
alate above, sometimes branched, occasionally more elongate and 
subrhizomatous; frond membranous, rather firm or slightly 
gelatinous, 60-120 yu thick, variable in form, suborbicular, cordate, 
or obovate, attaining a width of 4-30 cm., subentire, or sparingly 
or copiously lobed or proliferous, the lobes or proliferations con- 
formable or ovate, themselves sometimes once or twice lobed in 
similar fashion, the proliferations often stipitate, the apices 
rounded-obtuse, the margins plane or more or less ruffled-plicate, 
subentire, lightly sinuate-crenate, or now and then irregularly 
coarsely or obscurely dentate; surface dull or rarely subnitent, 
smooth; color (dried) violet-red (rosolane-purple to Indian lake”) ; 
edulla of stipe compact, sometimes pseudoparenchymatous, 
0.15-0.45 mm. thick; cortex of stipe or of its costa very firm, 
compact, parenchymatous, 8-30 cells thick, its cells in distinct 
anticlinal rows, cells of subcortex larger and irregularly disposed; 
medulla of frond moderately compact, its filaments mostly 3-8 u 
in diameter, usually interspersed (in older parts at least) with 
-coarser filaments, 6-20 » in diameter, having more homogeneous 
refringent contents, such filaments radiating from substellate 
ganglion-like enlargements 15-65 » in diameter; cortex of frond 
parenchymatous or subparenchymatous, 1 1-3 cells thick, the 
cells usually firm-walled, subquadrate in section, the superficial 
cells angular, mostly 5-10 in diameter in surface view, Sens 
outer walls 2-4 uw thick, protoplasts close (separated 2-3 mu), sub- 
cortex 1—3 cells thick, its cells mostly 13-25 » in diameter; ee. 
sporangia 12-16 uw X 8-10 yp; cystocarps unknown. 
Bermupa: In shallow water in clefts of rocks and caves and 
among roots-of Rhizophora; A. F. Kemp, August, 1856 (as 
Rhodymenia palmata); Walsingham, W. G. Farlow, February, 
1881; near Hamilton, M. A. Howe 60, June 12, 1900; Stokes Bay, 
Tucker’s Town, M. A. Howe 313, July 6, 1900; Harrington Sound, 
A. B. Hervey, January 15, 1913; Dingle Bay, A. B. Hervey, March 
30, 1915; Grasmere, A. B. Hervey, March 9, 1914; Old Ferry, 
A. B. Hervey, April 2, 1913; Castle Harbor, F. S. Collins, April 
25, 1912 (Phyc. Bor.-Am. 2050), and May 3, 1913. 
Type: Castle Harbor, near Tucker’s Town, April 25, 1912, 
F. S. Collins 7074, in herb. F. S. Collins. 
* ae 
Ridgway, R. Color standards and color seenbaciainre pl. 26. 1912. 
