44 University of California Publications in Botany [Vol. 10 



Fucus evanescens f. flabellatus f. nov. 



Plate 43 



Frondes 15-25 em. altae, subcoriaceae, subdichotomae vel partim 

 secundae, pallide brumieae vel luteolae, disco radicali parvo, stipite 

 parvo, 2-3 cm. longo ; segmentis linearibus vel paululum cuneatis, 

 10-15 mm. latis, strictis, apicibus rotundatis, parum truncatis, alis 

 comparative tenuibus, costa infra receptaculis paullo diminnata, cryp- 

 tostomatibus paucis, parvis, inconspicuis; receptaculis fusiformibus, 

 2-3.5 cm. longis, integris aut bifurcatis, obscure definitis. 



Growing on sandstone ledges in the middle of the littoral belt. 

 Bellingham, Washington. 



Type, Gardner, no. 2334 (Herb. Univ. Calif., no. 201168). July. 

 1910. 



The majority of the plants seem scarcely mature at this season of 

 the year, but enough of them were selected that appeared mature to be 

 fairly certain that the measurements given for the receptacles are 

 sufficiently accurate. The distinguishing character of the form is the 

 pronounced fan-shape of the whole frond when spread out, and par- 

 ticularly of groups of segments, due to the secund method of branching. 



The cryptostomata are relatively few and inconspicuous, and there 

 is approximately the same number of eaecostomata ; thus in this char- 

 acter the form is on the border line between F. evanescens and F: 

 furcatus. Probably the tendency is in the direction of the degeneration 

 of these organs. The other characters, however, seem sufficiently well 

 represented to ally it with F. evanescens. 



Fucus evanescens f . intermedius f. nov. 



Plate 44 



Frondes foliaceae, flaccidae, 12-18 cm. altae. obscure brumieae vel 

 luteolae, siccatae castaneae disco radicali et stipite parvis, angulis latis, 

 rotundatis; segmentis linearibus, supra axillas diminuatis, 1-2 cm. 

 latis, cryptostomatibus 12-25 in quoquo cm. quadrato, costa angusta, 

 percursa, alis comparative latis, membranaceis ; receptaculis basi latis, 

 1-2-furcatis, acuminatis aut acutis, complanatis vel muco inflatis, dis- 

 tinete definitis; eonceptaculis parvis, numerosis. 



Growing on rocks in the middle of the littoral belt. East Sound, 

 Orcas Island, Washington. 



Type, Gardner, no. 2333?) (Herb. Univ. Calif., no. 205692), July. 

 1910. 



This forms seems unmistakably connected, through its narrow 

 forms, with F. evanescens f. costatus on one side, and, on the other 



