46 ERYTHKA. 



Galothrix Braunii B. & F., found fairlj' abundantly in New 

 England and distributed from there by Tlolden (Pliyc, Bor.-Amer., 

 No. 112), has been found in the State of Washington by Miss 

 Tilden (Anier. Algai, No. 286b). No. 28r)a, however, as far as the 

 writer's copy of the AmericaTi Algre is concerned, is not C. Braunii, 

 but a species of Tolypothrix. The writer feels fairly certain in 

 referring also to C Braunii, the Isactis coispitosa formn tenuior viridis 

 of Wolle's Fresh Wa,ter Algce of the U. S. (p. 245, pi. 178, fig. 1-3, 

 & pi. 205, fig. 6, 7, 1887), although the latter figures are referred 

 to /. jluviatiliM in the e.vplauation to the {)lates. C. Braunii does 

 certainly resemble Isactis in its habit very much indeed. 



Galothrix adscendens (Nseg.) B. & F. has never been reported 

 from this country. A specimen distributed by Wolle under the 

 name of Mastigonema parasitievm Wolle, appears to be this species. 

 The specimen is number 83 of Wolle's Fresh Water Algse of the 

 United States (Exsicc), but the writer is unable to find any 

 description of this species in any of Wolle's published writings. 

 The filaments grow in stellate clusters, epiphytic on threads of 

 CEdogonium and Bulbochsete. They are somewhat enlarged at the 

 base and are from 20 to 24//. in diameter about half way up. The 

 sheath is colorless, thick, more or less stratified, and often beautifully 

 ochreate below. The heterocysts are basal and, in the material 

 examined, almost uniformly two, the lower one being smaller and 

 spherical, and the up[)er one larger and obiong. The cells of the 

 trichorae are from one-half to nearly twice as long as broad, have 

 brown contents, and are about 12;/. in diameter. The terminal 

 hair is very short. The writer has been unal)le to compare this 

 material with authentic specimens, but the agreement with the 

 description in Bornet and Flaliault is so exact as to leave little 

 room for doubt. 



There is no mention of locality on the label of Wolle's specimen, 

 but it probably came from Pennsylvania or New Jersey. 



Galothrix 'parasitica (Chauvin) Thuret not uncommon on the 

 coasts of Southern Europe and of New England, has been found at 

 San Diego and San Pedro, California, growing within the fronds of 

 Nemalion multifidum and Uehninthoeladia purpurea. 



