1925] Setchell-Gardner : Melanophyceae 521 



zontally into two. The fructiferous cells remain undivided. The 

 undivided cortical cells are about the same shape and size as the 

 medullary cells which also vary in shape and size.' 



6. Punctaria chartacea S. and G. 



Plate 45, fig. 79, and plate 81 



Fronds more or less finely buUate, membranaceous, chartaceous, 

 linear to broadly elliptical, base often cordate, margins finely fimbriate, 

 25-35 cm. (up to 50 cm.) long, 8-12 cm. (up to 30 cm.) broad, mature 

 plants 90-120ja thick, attached by a very small disk ; composed of 6-7 

 layers of cells, the surface cells being much smaller than the medullary 

 cells; cell walls thick, of light brown color, with intercellular spaces 

 among the medullary cells ; color dark brown, not changing on drying, 

 not adhering at all to paper; hairs, zoosporangia and gametangia 

 unknown. 



Growing on Eel grass in the lower littoral and upper sublittoral 

 belts. Sitka. Alaska. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 4. 



This species of Punctaria was found in great abundance, both 

 attached and floating. A large number of specimens were examined 

 in the last part of June and no reproductive cells could be found. 

 Neither were any hairs observed. 



7. Punctaria expansa S. and G. 



Plate 49, fig. 19 



Fronds gregarious, broadly expanded, more or less circular in out- 

 line, 20-30 cm. broad, 100-130/i, thick, very fragile, of medium brown 

 color, fading to green very soon after removal from water, composed 

 for the most part of four layers of cells, the medullary cells being 

 much larger than the cortical cells; neither the medullary nor the 

 cortical cells arranged in any definite series ; cortical cells four to six 

 sided and 30-40;u, diam. in surface view ; zoosporangia and gametangia 

 on the same frond, the former projecting but slightly beyond the sur- 

 face, the latter more or less conical and projecting one-half or more of 

 their length beyond the surface ; hairs present but sparse. 



Growing in a small quiet cove at the head of Penn's Cove, Whidbey 

 Island, Washington. 



Setchell and Gardner, Phyc. Cont., VII, 1924, p. 5. Punctaria 

 latifolia Setchell and Gardner, Alg. N.W. Amer., 1903, p. 240 (in part). 



