16 University of California Ptiblications in Botany [Vol. 10 



Fucus furcatus Ag. 



Plate 1, figure 1 



"Fronde lineari enervi plana furcata, receptaculis terminalibus. " 



"Ad Unalaschka, Chamisso. " 



"Vidi in herbario Chamissoi." 



"Frons plana, digitalis, linearis, parum dilatata, lineam vel sesqui- 

 lineam lata, 2-3 furcata, oranino enervis. Receptacula plana, unciara 

 vel sesquiunciam longa, fronde latiora, semper furcata, segmentis 

 attenuatis obtusis, tuberculatis ; tuberculis pertusis continentibus 

 glomerulos gelatinoso-filamentosos, in quibus capsulae ovatae limbo 

 hyalino circumfusae numerosae nidulantur. Color exsiccatae niger- 

 rimus. Substantia cartilaginea, exsiccatae rigida. " 



Agardh, Sp. Alg., vol. 1, 1820, p. 97. 



Fronds usually rigid, often arborescent, more or less cartilaginous, 

 for the most part decidedly mucilaginous, regularly dichotomous, olive 

 green to yellowish ; segments usually relatively long, slightly cuneate 

 to linear, in some cases decidedly crisped, midrib prominent and per- 

 current and often yellowish, caecostoraata few to very many; recep- 

 tacles for the most part complanate, sometimes tumid, often decidedly 

 yellowish. 



Growing in the middle and lower littoral belts. From Sitka, Alaska, 

 to Oil Port, San Luis Obispo County, California. 



Agardh, loc. cit., Icon. Ined., fasc. 2. 1821, pi. 14, Syst., 1824, p. 

 279 ; J. Agardh, Sp. Alg., 1848, vol. 1, p. 209. 



For a discussion of this species major see page 9. 



Fucus furcatus f. typicus f. nov. < 



Plates 2 and 3 



Frons paullo caulescens, paululum cartilaginosa, 20-30 cm. alta. 

 regulariter dichotoma, obscure olivaceo-viridis, siccata atra, segmentis 

 planis, linearibus vel cuneatis, 10-18 mm. latis, costa distincta, per- 

 cursa, caecostomatibus 250-300 in quoquo cm. quadrato, parvis, incon- 

 spicuis, cryptostomatibus nullis vel sparsissimis; receptaculis eom- 

 planatis, saepissime late linearibus, 4—6 cm. longis, saepissime bifidis, 

 apicibus acutis ; conceptaculis numerosissimis et comparative parvis. 



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

 belt. From the Strait of Juan de Fuca to central California. 



Type, Setchell, no. 1691 (Herb. Univ. Calif., 99171), Fort Ross, 

 California, June, ]897. Gardner, no. 2187 (Herb. Univ. Calif., no. 

 201151), I\ross Beach, San Mateo County, California. April. 1910. 



Fucus evanescens f. iypicn-s, Collins, IToldeii and Setchell, Phyc. 

 Bor.-Amer. (Exsicc), no. 1338. Fucus inflatus f. edentatus, Setchell 

 and Gardner, Alg.. N. W. Amer., 1903, p. 280. 



