19 - 2 ] Gardner: The Genus Fucus on the Pacific Coast 21 



Fucus furcatus f. nigricans f. nov. 



Plate S 



Frondes comparative fragiles, tenues, membranaceae, 35-45 cm. 

 altae. regulariter diehotomae, obscure olivaceo-viridis, siccatae atrae, 

 angulis latis paulum rotundatisque ; segmentis inf erne cuneatis superne 

 linearibus, ad segmenta terminalia 3-4 infra apicibus ad costam 

 diminuatis. ad singulem axillam diminuatis, usque ad 18-24 mm. latis ; 

 costa angusta distincta, percursa, alis teuuibus, caecostomatibus 70-80 

 in quoquo cm. quadrato, parvis, obscuris; receptaculis 2.5-3.5 cm. 

 longis. complanatis vel inflatis, integris vel bifidis, manifeste definitis, 

 apicibus plerumque acutis reflexisque. 



Growing on boulders and rock ledges in the middle of the littoral 

 belt. Cattle Point, south end of San Juan Island, Washington. 



Type Gardner, no. 23527? (Herb. Univ. Calif., no. 201195), July, 

 1910. 



Plate 8 represents the type specimen of this form. Comparison of 

 this plate with a representation of the type specimen of Kjellman's 

 F. evanescens f. cornutus on plate 55 shows the much more pronounced 

 cornute habit of the receptacles than Kjellman's plant possesses. In 

 this habit, forma nigricans is closely akin to forma cornutus, but differs 

 from it in the following characters: thinner fronds which are more 

 cartilaginous, darker color, black on drying, in having widely divergent 

 segments and in having an abundance of caecostomata. 



Fucus furcatus f. elongatus f. nov. 



Plate 9 



Frons sparse ramosa, distincte arborescens, parum foliacea, 3-5 dm. 

 alta, regulariter diehotoma, angulis latis rotundatisque, obscure 

 olivaceo-viridis, siccata obscure olivaceo-brunnea, segmentis longis, 

 10-18 mm. latis, cuneatis, segmento terminale saepe ovato. puncto 

 creseente parum depresso, costa angusta evidente, vulgo superne 

 luteola. alis inferne attritis, ad 4-5 segmenta terminalia persistentibus, 

 caecostomatibus variabilibus vulgo numerosis, usque ad 450 in quoquo 

 cm. quadrato, cryptostomatibus paucis, sparsis, paraphysum fasces 

 longos exsertes gerentibus; receptaculis obscure brunneis vel luteolis. 

 aut complanatis aut multo inflatis, distincte definitis, integris emargi- 

 natis vel bifidis. obtusis vel acutis, 3-5 cm. longis; conceptaculis nee 

 prominentibus neque numerosis. 



Growing on boulders in the lower littoral belt in localities exposed 

 to the surf. South end of San Juan Island, Washington, and Sunset 

 Beach, near the mouth of Coos Bay, Oregon. 



Type, Gardner, no. 2793 (Herb. Univ. Calif., no. 201178), Sunset 

 Beach. Oregon, Hay, 1914. 



