252 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Genus ERYTHROTRIGHIA Aresch. 

 Erythrotrichia californica Kylin 



Kylin, 1941, p. 3, fig. 1 A-D. 



The examples at hand are 1000-1500 fx high and 20-40 /x in diameter, 

 showing no cellular, basal disk. Though somewhat smaller than plants 

 examined from Monterey, California, this is perhaps due to their scanti- 

 ness and immaturity. It seems best to refer the Gulf plants to the Cali- 

 fornian species rather than to Erythrotrichia Kylinii from farther north, 

 which is also closely related here. 



D. 686b, epiphytic on Sphacelaria, Tiburon Island, July. 



Erythrotrichia carnea (Dillw.) J. Ag. 



J. Agardh, 1883, p. 15; Rosenvinge, 1909, p. 67, fig. 8. 



Several examples of this minute epiphytic red alga have been identi- 

 fied from various collections in the Gulf of California. It may be recog- 

 nized by its slender, unbranched filaments, 16-24 /* diam., of cells slightly 

 longer than broad, attached only by the basal cell and a few minute 

 rhizines. 



Genus ERYTHROPELTIS Schmitz 

 Erythropeltis discigera (Berthold) Schmitz 



Schmitz, in Engler & Prantl, 1896, p. 313. Erythrotrichia discigera, 

 Kylin, 1937, p. 44, fig. 19 A-C. 



Spreading disks of an epiphytic red which seems referable to this 

 species were detected on the fronds of Sphacelaria D. 686, Tiburon Is- 

 land, July. Short, erect filaments are present arising from the disks which 

 encircle the fronds of the host. Very close similarity is seen with the fig- 

 ures of Kylin, especially as to the appearance of the short, erect filaments. 

 Since the material is scanty and the erect filaments perhaps not fully de- 

 veloped, the present identification must be considered tentative. 



The predominance of the spreading disk over the very short, erect 

 filaments suggests that this plant should best be distinguished under 

 Schmitz' genus. Setchell, in a recent manuscript, has considered this treat- 

 ment most advisable and has included Erythrotrichia polymorpha Howe 

 and E. piilvinata Gardner in this genus. By distinguishing the genus 

 Erythropeltis from Erythrotrichia because of its spreading basal disks, the 

 present species is set well apart from Erythrotrichia californica and E. 

 carnea here recorded from the Gulf. From Erythrocladia it is distinct in 

 possessing erect portions. 



