"I 



I 



V 



1 

 4 



Saunders : SipnoNEo'% Algae of the Pacific Coast 3 



mers from a single large, flat-topped rock, incrusted by a Mclobesia^ 

 which at the lowest tide stood in a foot of water and was exposed 

 to the direct washing of the waves, Point Lobos (Central Califor- 

 nia coast). It has previously been reported for the North Atlantic 

 Ocean, Faroe Islands, Northern coast of Norway, and the Santa 

 Cruz Islands. 



M 



Derbesia VAUCHERiAEFORMis (Harv.) J. Ag. Till. Alg. System 



VIII., 34. 



C1ilorodes)nis ? vaucheriformis Harv. Nen Bor. An. III., 30. t. 



40. Jig. D. 



PI- 350. / 4' 



The filaments are tufted, light green, i cm. or so high, 30— 40/i 

 broad; branches erect, few, 20-30/^ broad, obtuse at the apex, 

 often with a cross-partition or a cuboidal cell near their union with 

 the main filament. The sporangia are elHptical, obovate or pyri- 

 form, 140-200/^ long and 50-80// wide ; zoospores large, 12-20 

 in a sporangia. 



This species was collected but once, at Point Lobos, the last 



of June, 1896, in the same locality as the last species. The plant 



is slightly smaller than the measurement given by Dr. Farlow* for 

 the same species from tlie Atlantic Coast but agrees in all other 



particulars. Not only do the sporangial stalks possess a cuboidal 



cell but either a cuboidal cell or a cross-partition is usually found 



near the base of the vegetative branches. 



In the size of the tufts and the diameter of the vc^retative fila- 



ments this species is very similar to Derbesia viarina (Lyngb.) 



Solier,t which perhaps should be considered as only a form 



of D. vaueJieriacfonnis as has been shown by Dr. Farlow ! The 



sporangia of D. marina according to Solier's figures, are shorter 



stalked and the sporangia are oblong and elliptical and but little 



narrowed below. Unfortunately no measurements of the sporangia 



are given. If the two species should prove to be distinct there is 



no reason in writing the latter as Dr. Toni;j; has done, Derbesia 



manna (Lyngb.) Kjellman, Ishv. Alg. Fl., for Kjellman in theit 



very monograph writes it Derbesia marina (Lyngb.) Solicr and cites 



the article of Solier referred to above. 



*rarlow, Mar. Alg. New Eng. 60. 



f Solier, Ann. Sci. Nat., III. 7: 158,//. g^figs, i~ij 



% De Toni, Syl. Alg. i : 426. 



gKiellman, Ishv. Alg. FI., 387. 



