1920] Setchell-Gardner : Chlorophyceae 197 



maximum diameter; fertile segments swollen to spherico-ellipsoidal, 

 long ellipsoidal, or even ventricose-ellipsoidal ; chromatophore a 

 coarsely reticulate, annular band. 



On rocks, etc., in the lower littoral belt. Friday Harbor, Washing- 

 ton (Frye), to Gualala, California {Brandt). 



Fries, Flora Scanica, 1835, p. 328 {"Wormskjoldii). Conferva 

 Wormskioldu Mertens, in Hornemann, Flora Danica, vol. 9, fasc. 26, 

 1816, p. 6, pi. 1547 (not H. Wormskioldii Setchell and Gardner, Alg. 

 N.W. Amer., 1903, p. 221, and not of Collins, Green Alg. N. A., 1909, 

 p. 368 as to Pacific Coast references and localities). Urospora Worm- 

 skiolddi Rosenvinge, Groenl. Havalg., 1893, p. 920, f. 36. 



It has been the practice to refer all the coarser species of Hormiscia, 

 especially those with much swollen fertile segments, to Hormiscia 

 Wormskioldii. In examining the specimens from the western coast 

 of North America and comparing them with specimens from the type 

 locality (Gothaab or Godthaab, on the southwestern coast of Green- 

 land) collected in 1831 by Vahl, we find sufficient differences to make 

 it seem best to distinguish three separate species. None of the speci- 

 mens from the West Coast previously referred by us, or others, to 

 Hormiscia Wormskioldii seems to us, at present, to be referable to it. 

 We have found specimens seemingly very close to it, however, in two 

 recent collections, as indicated above. 



Hormiscia Wormskioldii is to be distinguished from the other two 

 species we have referred to the section Wormskioldiiformes by its 

 coarsely reticulate chromatophore and its intermediate size (up to 

 1 mm. in maximum diameter of the fertile segments). The fertile 

 segments are usually long ellipsoidal. 



7. Hormiscia vancouveriana (Tilden) S. and G. 



Filaments attached by intramatrical rhizoids arising from 14—20 

 basal segments, soft, gelatinous, dark green, 10-15 cm. high, distinctly 

 clavate; segments cylindrical when young, 75-130fi diam., quadrate, 

 or up to 3 times as long as broad, soon becoming decidedly monili- 

 form, the upper segments almost spherical, up to 3 mm. in diameter ; 

 chromatophore thin, very slightly if at all perforate. 



Growling on stones and shells, in the lower littoral belt. On a small 

 island east of Oak Bay, Vancouver Island, British Columbia, July. 



Setchell and Gardner, m Gardner, New Pac. Coast Mar. Alg. IV, 

 1919, p. 494. Urospora Wormskioldii Setchell and Gardner, Alg. N.W. 



