1920] Setchell-Gardner : Phycological Contributions 283 



Growing on rocks along high-tide level. In the vicinity of San 

 Francisco, California. Type no. 4444, Gardner. 



TJlva califarnica Reed, Two ascomycetous fungi, etc., 1902, p. 149 

 (not of Wille). 



Ulva vcxata has been observed only in the vicinity of San Fran- 

 cisco, as mentioned above, where it grows in considerable profusion. 

 It seems quite probable that it may be much more widely distributed 

 both north and south of San Francisco. It might be suspected of 

 being a malformation due to the parasite always found more or less 

 infesting it, but the size and proportions of the cells of the less para- 

 sitized portions seem to mark it as a distinct species. 



Ulva angusta sp. nov. 



Plate 27 and plate 31, figure 1 



Thallo simplici aut rarissime lobato, lanceolato aut oblanceolato. 

 8-15 em. longo, 0.5-1.5 cm. lato, 35-45/i, (interdum prope SS/x) crasso, 

 basi aut longe abrupto ad stipitem delicatum solidumque attenuato, 

 disco affixo, dilute viridi, marginibus fere planis usque ad erispatissi- 

 mis ; cellulis e superficie 3-6 lateralibus angulis rotundis, 5-12fx diam. 

 seetione transversali quadratis ad 1.5-plo longioribus, angulis rotundis; 

 chromatophoris dimidium externum cellularum implentibus; pyrenoi- 

 dibus singulis. 



Frond simple or very rarely lobed, lanceolate to oblanceolate, 8-15 

 cm. long, 0.5-1.5 cm. wide, 35-45/i, thick (occasionally about 53,u), 

 tapering either gradually or abruptly at the base to a delicate, solid 

 stipe with discoid holdfast, color of fronds pale green, margins varying 

 from almost plane to very much crisped ; cells in surface view 3-6 

 sided, with rounded angles, 5-12/x, diam. in section, quadrate to one 

 and a half times longer than broad, with rounded angles ; chromato- 

 phore filling the outer half of the cell ; pyrenoid single. 



Growing in shallow pools along high-tide level. Moss Beach, San 

 Mateo County, California, April, 1919. Type no. 4430, Gardner. 



"We find at several places along the coast of central California a 

 rather short and narrow Ulva which does not seem to belong to any 

 of the hitherto described species. We have felt compelled, therefore, 

 to give it a name. It resembles the Phycoseris lapathifolia of Kuetzing 

 (1856, pi. 25), but is shorter and narrower. It also resembles, even 

 more closely, Kuetzing 's figure of Phycoseris Lima (1856, pi. 16, fig. 1 ) , 

 but is a smaller plant than that also. The short, flattened stipe is solid. 

 The narrow blade varies from plane to undulate or even crisply 

 ruffled on the margins. The cells are oblong or rounded in section, 

 each provided with a more or less distinct wall. Although we have 

 only recently become acquainted with it, this seems to be a vernal 

 species. It has been observed in fertile condition in April. 



