500 BULLETIN OF THE BUREAU OF FISHERIES. 



our range. If our plants belong to this species, this constitutes their northern known limit, since the 

 specimens referred to this species by Farlow (1882, p. 167) are now attributed, with considerable doubt, 

 to C. dasyphylla. 



This species is distinguished from C. atropurpurea by its larger size, looser habit, longer branchlets, 

 less acute apices, and lighter color. It is distinguished from C. tenuissima, which it resembles in habit, 

 by its usually larger size, considerably coarser fronds, and less regular branching. 



3. Chondria tenuissima (Goodenough and Woodward) Agardh. 



Fucus tenuissimus, Goodenough and Woodward, 1797, p. 215, pi. 19. 

 Chondria tenuissima, Agardh, 1822, p. 352 (excluding synonyms). 

 Chondria tenuissima, Harvey, 1853, p. 21, pi. 18 F. 

 Chondriopsis tenuissima, Farlow, 1882, p. 166. 

 - Chondria tenuissima, De Toni, 1903 p. 834. 

 P. B.-A. No. 42. 



Fronds slender, 6 to 24 cm. tall, about 0.5 to 1.5 mm. in diameter in main stems, pyramidal in out- 

 line, irregularly, alternately branched, main branches spreading, bearing more or less numerous secondary 

 branches, and slender, spindle-shaped, spreading branchlets about 4 to lomm. long, apices conspicuously 

 prolonged, secondary branches and branchlets tapering at the bases; tetrasporangia borne below the 

 apices of ultimate branchlets; cystocarps ovate, sessile on the ultimate branchlets, sometimes occupy- 

 ing almost the entire branchlet. 



Warm and temperate North Atlantic; Mediterranean. 



Var. baileyana (Montagne) Farlow, Anderson, and Eaton. PI. CVII, fig. 3. 



Laurencia baileyana, Montagne, 1849, p. 63. 

 Chondria baileyana, Harvey, 1853, p. 20, pi. 18 A. 

 Chondriopsis tenuissima var. baileyana, Farlow, 1882, p. 166. 



, Chondria tenuissima var. baileyana, Farlow, Anderson, and Eaton, 1889, A. A. B. Ex. No. 187. 

 Chondria tenuissima var. baileyana, De Toni, 1903, p. 836. 

 A. A. B. Ex. No. 187. 

 P. B.-A. No. 43- 



Frond very slender, 3.5 to 20 cm. tall, about 0.2 to i mm. in diameter in main stems; more or less 

 loosely branched, branches elongated, erect, rather simple, bearing very slender, spindle-shaped or club- 

 shaped branchlets, tapering at the bases but obtuse at the apices, apices slightly or not at all prolonged. 

 New England to North Carolina; Europe. 



Fairly abundant in harbor north of laboratory, Beaufort, N. C., abundant on Fort Macon jetties, 

 April, 1908, 10 cm. above to 10 cm. below low water, few very slender specimens on shells and other 

 algae between jetties, Fort Macon, July, 1909, only tetrasporic fruits observed. 



This species is usually distinguished without difficulty by its slender habit and long, slender 

 branchlets, although some specimens bear resemblances to C. littoralis and C. atropurpurea. The variety 

 is distinguished from the species by its more slender habit and the shape of its branchlets, these taper- 

 ing at the bases and being blunt, obtuse, and slightly or not at all prolonged at the apices, having the 

 shape of a club rather than that of a spindle. Neither the species nor the variety was observed here in 

 May, 1907. This is the southern known limit of the variety. 



4. Chondria dasyphylla (Woodward) Agardh. Figs. 38-40; PI. CVII, figs. 2 and 4. 



Fucus dasyphyllus, Woodward 1794, p. 239. 

 Chrondria dasyphylla, Agardh, 1822, p. 350. 



, , , . . 



Chondria dasyphylla, Harvey, 1853, p. 20. 

 Chondriopsis dasyphila, Farlow, 1882, p. 166 (excluding variety). 

 Chondriopsis littoralis, Farlow, 1882, p. 167. (?) 

 Chondria dasyphylla, De Toni, 1903, p. 842. 



A. A. B. Ex. No. 

 P. B.-A. No. 142. 



Fronds robust, coarse, 7 to 20 cm. tall, about 0.5 to 2 mm. in diameter in main stems, often pyramidal 

 in outline, often sparingly branched below, usually densely branched above, branching alternate, fairly 

 regular, sometimes opposite or fasciculate, main branches elongated, spreading, more or less decompound, 

 tapering gradually toward the apices, secondary branches more or less elongated and tapering, ultimate 

 branchlets usually 2 to 5 mm., sometimes up to 2 cm., long, sometimes borne on the main brandies, 



