192 ->] Setehell-Gardner: Melanophyceae 519 



3. Punctaria latifolia Grev. 



Fronds gregarious, flaccid, adhering firmly to paper, 1-3 dm. high, 

 2-7.5 cm. wide, 70-85//. thick, linear to obovate, attenuated at the base ; 

 color yellowish to light brown; composed of four layers of cells, the 

 outer layers smaller than the inner ; gametangia projecting but slightly 

 above the surface ; zoosporangia, unknown. 



Occasional in quiet sandy coves (fide Saunders). 



Greville, Alg. Brit., 1830, p. 52 ; Setchell and Gardner, Alg. N.W. 

 Amer., 1903, p. 240. Homoeo stroma latifolium Saunders, Alg. Harri- 

 man Exp., 1901, p. 420. 



We have examined a few small specimens of a Punctaria collected 

 by Saunders at Metlacatla and on Baranoff Island, Alaska, and pub- 

 lished (Joe. cit.) as P. latifolia, which seem to belong to this species. 

 We are referring them here with some doubt on account of their 

 much reduced size as compared with Wyatt's no. 9, of the Algae Dan- 

 monienses, which we are taking a.s fairly typical of the species. The 

 measurements of the cross-section of the fronds and the shapes and 

 sizes of the cells composing the four layers agree very well with those 

 of her distribution, both being 70/* to 80/j. in diameter. 



4. Punctaria lobata (Saunders) S. and G. 



Fronds broadly linear, lanceolate or ovate, 10 or more cm. long, 1-5 

 cm. wide, narrowed below to a short stipe of a dark olive brown color, 

 composed of 4 layers of cells, the 2 inner layers larger than the outer 

 layers; edges deeply and irregularly lobed, the lobes irregularly cut 

 and divided ; zoosporangia scattered over the whole surface of the 

 plant ; gametangia unknown. 



Attached to Zostera marina. Prince William Sound and Sitka, 

 Alaska. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 12. Homoeostroma 

 looatum Saunders, Alg. Harriman Exp., 1901, p. 420. 



We have not seen any material belonging to this species and are 

 including it here without comment, having previously made the above 

 combination (loc. cit.). 



