382 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



mutually free ; aplanospores obovoid, 140-160X105-120 p.. Ba- 

 hamas, Cuba. 



A shorter and stouter plant than N. dumetosa, with very soft 

 and gelatinous membranes. 



3. N. ANNULATA Dickie, 1874, p. 198 ; Howe, 1909, p. 87, 

 PL I, fig. 2; N. Kelleri Cramer, 1888, p. 3, PI. I, fig. 2 ; PI. 

 II, figs. 1-12; PI. Ill, figs. 1-2; 1890, p. 9, PL I, figs. 1-12; 

 PL II, figs. 1-6; PL IV, figs. 15-24; Vickers, 1908, p. 28, PL 

 XL/ VI ; N. dumetosa P. B.-A., No. 668. Mostly densely gre- 

 garious, subcylindrical or fusiform-clavate, 5-25 mm. high, 1-2 

 mm. thick, apex subacute ; primary branches 200-280 /u, long, 

 11-20 /j. median diam., 20-56 in a whorl, whorls 60-175, 115-250 

 p. apart ; secondary branches capitate, inflated at the tip to 

 80-135 /" diam., outwardly usually rounded, rather firm-walled, 

 strongly calcified except at the outer end, firmly coherent ; 

 sporangia strongly calcified and laterally coherent into nearly 

 complete or more or less interrupted rings ; aplanospores 

 oblong-ovoid to oblong-ellipsoid, 115-175X46-80 p.. Fig. 143. 

 Fla., W. I. So. America, Indian and Pacific Oceans. 



The complete or somewhat broken rings of sporangia can gen- 

 erally be depended on to distinguish this species. 



4. N. COKERI Howe, 1904, p. 97, PL VI, figs. 3-12; 1905, 

 p. 580; 1909, p. 89, PL I, fig. 6. Solitary or somewhat grega- 

 rious, subcylindrical or clavate, 7-37 mm. high, 1.5-3 mm. diam., 

 apex rounded, obtuse or subtruncate ; primary branches 200-300 

 p. long, 30-40 /j. diam., 12-56 in a whorl, whorls 60-175, about 

 100 fi apart; secondary branches somewhat calcified, scarcely 

 adherent, subfusiform, curved or gibbous, 100-150 /u. diam. near 

 the middle, tapering to 22-34 p. at the truncate apex; terminat- 

 ing in a hair ; hairs of two kinds, the first unicellular, clavate, 

 curved or hooked, diam. about equal to that of the supporting 

 cell, the second with a similar but narrower basal cell, bearing 

 at its apex two slender, subcylindrical cells, each in its turn 

 with 2-4 similar but smaller branches ; the two forms of hairs in 

 separate zones ; sporangia strongly calcified, free or coherent in 

 rows of 2-8 ; aplanospores obovoid or oblong-ellipsoid, 140- 190 >< 

 82-94 /* Bahamas. 



Distinguished by the fusiform secondary branches and the 

 two types of hairs, in distinct zones on the same individual. 



5. CYMOPOLIA L,amouroux, 1816, p. 292. 



Frond branched, consisting of a series of bead-like calcified 

 joints, connected by contracted, flexible uncalcified portions, in 

 which the branching occurs ; stem and branches terminated by 



