1920] Setchell-Gardner : Chlorophyceae 229 



6. Spongomorpha spinescens Kuetz. 



Plants orbicular in outline, with short symplocoid divisions; fila- 

 ments about 80/x diam. below, lOOju, diam. at tip ; seg*ments 0.5-1 diam. 

 long below, 2 diam. long at tip ; normal, erect, somewhat obtuse 

 branches abundant; also patent and acute branches, either short and 

 spine-like, or long, hooked, revolute and circinate, uniting the filaments 

 into branching symplocoid tufts; descending rhizoidal branches slen- 

 der and abundant. 



Growing on the tips of algae and sponges along the upper tide 

 limit in exposed places. Bay of Unalaska, Alaska, to Coos Bay, 

 Oregon. 



Kuetzing, Tab. Phyc, vol. 4, 1854, p. 16, pi. 75, II ; Collins, Green 

 Alg. N. A., 1909, p. 360. Cladophora spinescens Kuetzing, Sp. Alg., 

 1849, p. 418; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 227. 

 Cladophora saxatilis Setchell and Gardner, loc. cit., p. 223 (in part). 

 Cladophora arcta f. pulvinata Collins, in Setchell and Gardner, loc. 

 cit., p. 225. Spongomorpha arcta f. pulviihata Collins, Green Alg. 

 N. A., 1909, p. 360 (not of Foslie). Clad-ophora arcta f. conglutinata 

 Collins, in Setchell and Gardner, loc. cit., p. 225 (in large part). 

 Spongomorpha arcta f. conglutin>at<a Collins, Green Alg. N. A., 1909, 

 p. 359. Cladophora arcta Harvey, List N.W. Alg., 1862a, p. 176 (at 

 least in part). Cladophora scapaeformis Setchell and Gardner loc. cit., 

 p. 227 (in part). 



Spongomorpha spinescens was founded on a specimen sent by 

 Lenormand to Kuetzing from the coast of Morbihan, a department 

 of France on the northern short of the Bay of Biscay. A topotype 

 of this species, if not possibly a cotype, exists in the Herbarium of 

 the University of California (no, 145264), i.e., it is from the same 

 locality and sent out by Lenormand. It also answers in full to 

 Kuetzing 's description. 



Spongomorpha spinescens is characterized by abmidant acute 

 branches and branchlets with some of the short, simple, acute branch- 

 lets curved into definite hooks. In looking over our Alaskan and 

 Puget Sound materials, we find a number of specimens which corre- 

 spond well in habit and other characters with the descriptions and 

 figures of S. spinescens as well as with the specimen mentioned above. 

 We feel fairly certain in referring them to Kuetzing 's species. We 

 have also compared our specimen with the descriptions of Acrosiphonia 

 albescens Kjellman and A. hamulosa Kjellman as well as with speci- 



