l925 l Setch&ll-Gardn&r: Mekmophyceae . 505 



doliiform, 2-3 times as long as the diameter at the base, 0.3-0.8 times 

 as long- a short distance above the base. 1-1.5 times as long in 1 1n- 

 widest part, up to 6 times as long at the apex ; chromatophore a fine 

 nodular network in the young cells, separating more or less into 

 spheroidal masses in the older cells; zoosporangia subovate to broadly 

 clavate. 75-100/* (up to 135/*) long, 30-40/* broad at the outer end; 

 gametangia unknown; paraphyses clavate, about 225/* long, slightly 

 curved at times but not sensibly constricted at the dissepiments. 



Growing on other species of algae, especially those of Rfvodymenia. 

 From Prince William Sound to Wrangell, Alaska. 



Ruprecht, Tange Ochots. Meer., 1851, p. 196 (388 Orig.) ; Setchell 

 and Gardner. Alg. N.W. Amer, 1903, p. 248; Collins, Holden and 

 Setchell. Phyc. Bor.-Amer. (Exsicc), no. 828. 



The type of Elachistea lubrica Rupr. came from the Ochotsk Sea, 

 but Ruprecht states that specimens from Russian Lapland are in 

 close agreement. The most typical specimens seem to grow upon 

 species of Halosaccion and Rhodymenia. Specimens from Yakutat 

 Bay collected by Saunders (Phyc. Bor.-Amer., no. 828) and by Albin 

 Johnson as well as at Orca by Setchell, seem to agree well with speci- 

 mens distributed from Spitsbergen by Kjellman and from Mehavn in 

 Finmarken (Phyk. Univ., no. 366) collected by Foslie. The free fila- 

 ments taper both above and below as in E. fucicola, but the paraphyses 

 are less curved, only slightly, if at all, constricted at the dissepiments, 

 and the upper cells are inclined to be broader than high. 



14. Gonodia Xieuwland 



Fronds minute, tufted, composed of a mass of colorless, densely 

 intertwined filaments, mostly penetrating the host, giving rise to a 

 dense mass of erect assimilating filaments and "hairs," at least at 

 times; ' paraphyses " wanting; reproduction by zoosporangia and 

 gametangia. 



Xieuwland, Critical Notes IX, 1917, p. 30 ; Setchell and Gardner, 

 .Alar. Alg. Gulf Calif., 1924, p. 722 ; Myriactis Kuetzing, Phyc. gen.. 

 1843, p. 330. 



The distinctions between Gonodia and Elachistea are not always 

 readily discernible in all of the species. In the younger stages of some 

 of the species of Elachistea, and at times in the older stages, the basal 

 portion, especially if it penetrates the host, is of about the same degree 

 of compactness as it is in the mature stages of the species of Gonodia. 



