418 Vniversity of California Publications in Botany [Vol. 8 



is convinced from the description of Dillenius, as well as by "the 

 original drawing in Sir Joseph Bank's Library" that he is correct 

 in his interpretation. 



Ectocarpus tomentosus varies much in height and in the matter 

 of the greater or less branching of the rope-like masses into which the 

 erect filaments and their branches are intertwined. Our Pacific Coast 

 plants are all shorter than the average and more simple. We have 

 found, in certain specimens, long seriate intercalary gametangia of the 

 type of those of Pylaiella near the tips of some of the branches. The 

 occurrence of such gametangia in several species of true Ectocarpus 

 is worthy of note as well as extremely puzzling. They were par- 

 ticularly noticed also in specimens of E. confervoides f . variabilis. 



The name Conferva tomentosa first appears in 1762 in the earliest 

 edition of Hudson's Flora Anglica (p. 480). Hudson quotes two 

 numbers of Dillenius's Historia Muscorum (1741), viz., no. 12 and 

 no. 13 (loc. cit., p. 19 and pi. 3, figs. 12 and 13). In the later editions 

 of his work (1778, etc.) Hudson quotes only the second (no. 13) of 

 these Dillenian descriptions as truly C. tomentosa, referring the first 

 (no. 12) to his Conferva alhida, now usually recognized to be Clado- 

 phora alhida Kuetzing. The actual founding of Conferva tomentosa 

 in the sense of Dillwyn, therefore, rests on the synonymy quoted in 

 the edition of 1778 which is, so far as we are aware, the only Hudsonian 

 reference thus far quoted for the species. 



5. Ectocarpus corticulatus Saunders 



Fronds 0.2-3 cm. high, tufted or feathery, from a small compact 

 mass of creeping filaments ; main filaments 90-120/x broad, usually 

 densely corticated, irregularly and frequently branched ; cells of main 

 filament 65-90/* broad, usually shorter than long, doliif orm ; cells of 

 branches and ramuli seldom as long as broad, terminal cells tapering, 

 blunt ; chromatophores band-shaped, few in each cell, often with 

 pyrenoids ; sporangia unknown ; gametangia narrowly to broadlj^ 

 ovoid, 30-40/x long, 12-18/* broad, secund on the branches and ramuli, 

 or even on the corticating filaments, short-stalked or sessile. 



On larger Melanophyceae and on Zostera. Alaska (Popof Island) 

 to southern California (San Pedro). 



Saunders, Phyc. Mem., 1898, p. 152, pi. 20. Ectocarpus confer- 

 voides corticulatus Saunders, Alg. Harriman Exp., 1901, p. 418 ; 

 Setchell and Gardner, Alg. N.W. Amer., 1903, p. 238; Collins, Mar. 



