44 Universifij of (Utlifornia I'lihlirations in Botany [Vol. 10 



Fucus evanescens f. flabellatus f. iiov. 



Plate 43 



Frondes 15-25 cm. altae. siibeoriaceae, subdiehotomae vel partim 

 secnndae. pallide hrunneae vel liiteolae. disco radical! parvo, stipite 

 parvo, 2-8 cm. longo; segmentis linearibus vel paiiluhim euneatis, 

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

 comparative tenuibus, eosta infra receptaculis paiillo diminnata, eryp- 

 tostomatibus pancis. parvis. inconspicuis ; receptaculis fusiformibus, 

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



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

 Belli ngham, "Washington. 



Type, Gardner, no. 2334 (Herb. TTniv. 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 caecostomata ; 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 bnunieae vel 

 luteolae, siccatae castaneae disco radicali et stipite })arvis. angulis latis, 

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

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

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

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

 tinete definitis; conceptaculis ])arvis. numerosis. 



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

 Oreas Island, Washington. 



Type, Gardner, no. 23336 (Herb. Univ. Calif., no. 205692), July. 

 1910. 



This forms seems unmistakably connected, through its nari'ow 

 forms, with T*'. evan( sc< )is f. coslatit.s on one side, and, on the other 



