1 1 2 Rhodora [Junk 



of one to several cells, from .01 to .02 mm. diam., not much tapering, 

 end slightly rounded, without terminal hair. Cells throughout the 

 frond usually about 4 times as long as broad, but where the forkings 

 are very dense, 1 to 2 times as long. Cystocarps depressed spherical, 

 not distinctly lobed, single or several together, situated in the forking 

 of a lateral branch, or on the side of a main filament. Antheridia 

 forming tufts on the upper side of the ultimate ramuli, occurring on 

 the same individual as the cystocarps. Tetraspores tripartite, occa- 

 sionally cruciate, pyriform, sessile on the upper side of the ultimate 

 ramuli, often one on each joint. Color a pale to a deep rose. 



This species presents quite a difference in habit, according as the 

 alternate or the dichotomous system of branching is most developed, 

 and as the latter is more or less dense. The two extreme forms resem- 

 ble respectively C. Baileyi Harv. and C. cori/mbo,mm (Eng. Bot.) Ag.; 

 its nearest affinity would seem to be with C. con/mbo^9um. It adheres 

 well t9 paper. Washed ashore, Key West, Florida. Mrs. G. A. Hall. 



1148. Ptilota pectinata (Gunner) Kjellman forma tenuis, n. f. 

 A comparison with the typical P. pectinata, distributed as No. 392, 

 P. B.-A., shows this to be a much more delicate form, resembling 

 rather Plum aria clegans (Bonnem.) Schmitz in habit. On rocks 

 between tides, San Juan Island, W^ashington, June 25, 1899. N. L. 

 Gardner. 



847. Ceramium strictum (Kiitz.) Harv. forma proliferum, n. f. 

 Differs from the type by the more abundant lateral branches, by which 

 it approaches C. diaphanum. It is perhaps the C. diaphanum of 

 Harvey, Nereis Bor.-Am., part 2, p. 215, but not the C diaphanum of 

 Roth, which has not been founti on this coast. On sand covered rocks,, 

 Bridgeport, Connecticut, July 12, 1891. Isaac Hohlen. 



750. Halymenia Floridana J. Ag. forma dentata (Crouan), n. 

 comb. Gelinaria deniata Crouan in Maze et Schramm, Algues de 

 Guadeloupe, 1870. Washed ashore, Indian River Inlet, Florida, 

 May, 1899. Mrs. G. A. Hall. 



650. CoRALLiNA GRACILIS Lamour. forma densa, n. f. The 

 densely appressed branches give this form a quite different appearance 

 from the typical C. gracilis, distributed as P. B.-A., No. 399; but there 

 seem to be no distinctive characters sufficient to entitle it to rank as a 

 species, a. On rocks exposed to the waves, Dillon's Beach, Marin 

 County, California, Dec. 11, 1898. b. On exposed rocks. Pyramid 

 Point, Monterey County, California, Jan. 8, 1899. W . A. Setchell tfr 

 R. E. Gibbs. 



