1920] Setchell-Gardner : Chlorophyceae 277 



1. Prasiola calophylla (Carraicli.) Menegh. 



Fronds linear to narrowly cuneate, with truncate apex, many from 

 the same holdfast, seldom over 1 cm. long, 1 mm. wide ; cells near the 

 base in a single series, about 10^ long by 3-5ju, broad; farther up in 

 two rows, the number increasing towards the upper part of the frond 

 or as the frond grows older; the series of cells and the intercellular 

 lines nearly parallel throughout; cells near the apex of the frond 

 about 3-5/* diam., square ; thickness of frond about 15/a ; cells 8-10/* 

 high in cross section. 



Growing in brackish water. Washington (Whidbey Island). 



Meneghini, Cemii sull' Organografia, 1836, p. 36; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 215; Collins, Green Alg. N. A., 

 1909, p. 219. Bangia calophylla Carmichael, in Greville, Scottish 

 Crypt. Flora, vol. 4, 1826, p. 220. 



This species has been observed onlj' once in anything like a marine 

 locality. One of us (Gardner) found it at the head of Penns Cove 

 on Whidbey Island, growing within reach of pure salt water. It is 

 a small, slender species and is easily recognized by having a long 

 tapering stipe ending below in a single row of cells. It is probably 

 not to be expected at all frequently in marine localities. 



2. Prasiola borealis Reed 



Plate 10, figs. 1-3 



Fronds cuneate to obovate, stipitate or sessile, margin crenulate, 

 crisped or entire, soft membranaceous, 33-45/* thick, 5-10 mm. high, 

 in tufts of several from one holdfast; cells in distinct tetrads, areolar 

 arrangement manifest ; cells 4-9/i diam., seen superficially ; in cross 

 section oblong or palisade-form, ll-14/i high ; aplanospores probably 

 numerous wnthin each aplanosporangium, in groups of 8. 



Growing on rocks just above high water mark. Alaska. 



Reed, Two new ascomycetous Fungi, 1902, p. 160, pi. 15, f . 7 ; 

 Collins, Green Alg. N. A., 1909, p. 220; Setchell and Gardner, Alg. 

 N.W. Amer., 1903, p. 215 ; Trelease, The Fungi of Alaska, 1904, p. 34, 

 pi. 7, f. 1, 5. 



Prasiola horealis has been found only on the Alaskan coast 

 (Unalaska, Kadiak and Baranof Island) and always infested with 

 a fungus {Guignardia alashana Reed), thus resembling the Mastodia 

 tessellata Hook, and Harv. (cf. J. D. Hooker, 1847, p. 499, pi. 194, II) 



