110 Rhodora [Jink 



inon form of muddy shores in southern Xew England. Among 

 ■Spartina, etc., on mud flats near high water mark, Mattapoisett, 

 Massachusetts, Sept. 14, 1902. F. S. Coll{n.s. 



S33. Sargassum hacciferum (Turn.) J. Ag. forma angustum, 

 n. f. Found in company with the form distributed as No. S32b, hut 

 (piite distinct in habit, slenderer in all the parts. The two forms did 

 not seem to be connected by any intermediate forms. In floating 

 masses, lat. 25.58/ X., long. 73.39, W., June 1900, Stmr. Admiral 

 Sampmn. Mrs. V. E. Peaxe A- Mi'sm E. Butler. 



1087. Batrachospermum macrosporum (Wood) Collins, n. comb. 

 Chantransia macro.ipora Wood, F. W. Algae of the U. S., p. 21(), 

 PI. XIX, fig. 3, 1872; Wollc, F. W. Algae of the U. S., p. 59, 

 PI. LXIX, figs. 1-12, 1887. The Batraciwspermum form having 

 been found, both in the Alabama material here distributed and in 

 similar material from Florida, developing from a Chantramia form 

 identical with the Xantucket material here distributed, the specific 

 name given by Wood to the Chaniransia has been used ft)r the Baira- 

 chospermum., which appears to be a species hitherto undescrilied. a. 

 C/ianfransia form, Gibbs' Pond, X'^antucket, Massachusetts, Aug. 3, 

 1895. W. A. SetcheU and W. J. V. Ostrr/tout. h. Batracho.sprrmiim 

 form, on logs, sticks and stones in Fly Creek, a clear spring-fed creek 

 that empties into Mobile Bay, Alabama. De A. Saunder.s'.^ 



990. Batrachospermum vagum Ag. var. flagelliforme Sirdt. 

 forma tenuissima. n. f. A slenderer form than that distributed under 

 No. 188 of this work, but probably the same variety. Outlet of Ox 

 Bow Lake, near Lake Piseco, Adirondack Mountains, Hamilton 

 County, X^ew York, Aug. 24, 1896. Lmar Holden. 



836. SciNAiA flr('ell.\ta (Turn.) Bivona forma complanata, 

 n. f. The frond is fiatteneil throughout, even when quite fresh. The 

 iiabit resembles that of uncalcified Galaxaurata obiumta (Ell. & Sol.) 

 Lamour., but the structm-e agrees with the typical ^S". furrellata. Pos- 

 sibly the same as the plant described as I si/ men ia angusta J. G. Agardh, 



1 Erroneo\isly printed lat. 55.58, N. in laliel. 



2Tlie name Batrachospermum macrosporum having' been used hy Montagne for a piant 

 from Guiana, Ann. Sci. Nat., .Series .3. Hot., Vol. XIV, p. 283, 1850, is no longer avail- 

 able for tins plant, and B. australe is proposed in its place. The cliaracters of the 

 Batrachospermum stage nniy be briefly charaeterized as follows: color grayish green to 

 gray violet: main liranches virgale, with few long and many short branches, the latter 

 at right angles, with acuminate tips: verticils pear-shaped to spherical, rather distant 

 below, very close above; interverticilary filaments few; trichogyne stoutly clavate. 



