196 • University of California Publications in Botmiy [Vol. 8 



it to the genus Hormiscia. The type locality of the species is Chris- 

 tineberg on the west coast of Sweden, where it occurs mixed with 

 Hormiscia penicilliformis and Ulothrix flacca. On the West Coast 

 of North America it occurs mixed with the same species and also with 

 Hormiscia Wormskioldii. It is to be compared with Urospora elmignta 

 (Rosenv.) Hagem but is of much greater diameter and with thicker 

 walls in the fertile segments. The chromatophore is very coarsely 

 reticulate. 



5. Hormiscia sphaerulifera S. and G. 



Plate 9, fig. 2 



Filaments very lubricous, bright green, protoplast becoming dark 

 when dry, 4-6 cm. long, up to TOOju, diam., tapering abruptly at the 

 base, of nearly uniform diameter above, attached by intramatrical 

 rhizoids ; segments 0.5-2 times as long as the diameter, cylindrical 

 when young, becoming almost spherical at maturity; chromatophore 

 a thin, unbroken band, pyrenoids small, numerous. 



Growing on boulders in the extreme lower littoral belt. West coast 

 of Whidbey Island, Washington. 



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

 1919, p. 493, pi. 42, f. 2. Urospora Wormskioldii Setchell and Gard- 

 ner, Alg. N.W. Amer., 1903, p. 221 (in part) ; Collins, Holden and 

 Setchell, Phyc. Bor.-Amer. (Exsicc), no. 915 (not Conferva Worm- 

 skioldii Mert.). 



In a careful study of the west coast specimens previously referred 

 to Hormiscia (or Urospora) Wormskioldii, considerable differences 

 were found which have led to their segregation among three species. 

 The present species is the most slender of the group, reaching a maxi- 

 mum diameter, even in the fertile segments, of 700fi. The chromato- 

 phore seems to consist of a thin, unbroken, annular band. The fertile 

 segments are swollen into a spherical shape and the upper portions of 

 the filament are in the form of a necklace. The filaments are very 

 lubricous and adhere tightly to paper. 



6. Hormiscia Wormskioldii (Mert.) Fries 



Filaments attached by intramatrical rhizoids arising from 12 to 

 15 of the basal segments, dark green, 10-20 cm. high, distinctly 

 clavate ; segments cylindrical below or when young, 30-60|tt in diam- 

 eter, increasing above in fertile segments to 500/^ or even to 1 mm. in 



