192 -] Gardner: The Genus Fucus on the Pacific Coast 25 



Fucus furcatus f. latifrons f. now 



Plate 14 



Frons distincte foliacea, contorta, comparative tenuis, 25-35 em. 

 longa, inferne obscure olivaceo-brunnea, superne pallide brunnea, 

 siccata atra. dichotoma, angulis vulgo acutis ; segmentis cuneatis, seg- 

 mentis terminalibus vulgo rotundatis, 2-3.5 cm. latis, costa inferne 

 prominente, superne distincte diminuante, caecostomatibus 40-80 in 

 quoquo cm. quadrato; receptaculis indistincte definitis, complanatis, 

 2-3-furcatis, vulgo acutis ; conceptaculis amplis, vulgo costam descend- 

 entibus, segment! partem cuneatam vestientibus. 



Growing on rocks in tbe middle and lower littoral belts. Channel 

 Rocks, near Fort Ward, west of Seattle, Washington. 



Type. Gardner, no. 1972 (Herb. Univ. Calif., no. 201221), August, 

 1908. Fucus evanescens f. pergrandis, Collins, Holden, and Setehell, 

 Phyc. Bor.-Amer. (Exsicc), no. XCI. 



In width of fronds, this form of F. furcatus overlaps or merges 

 into forms of F. evanescens, e.g., forma magnificus. I am placing it 

 under furcatus on account of the dark olive green color, more or less 

 cartilaginous consistency, and particularly on account of the abund- 

 ance of caecostomata. 



It is closely related to F. furcatus f. rigidus, but the fronds are 

 more foliaceous, the receptacles are wider and shorter and the caeco- 

 stomata are less abundant. 



Fucus furcatus f. contortus f. nov. 



Plate 15 



Frons 20-30 cm. alta, inferne caulescens, superne foliacea, robusta, 

 cartilaginosa, valde contorta, dichotoma vel subdichotoma, inferne 

 olivaceo-viridis, superne luteola, siccata obscure olivaceo-castanea ; seg- 

 mentis inferne cuneatis marginibus crispatis, superne linearibus, supra 

 axillas diminuatis, 2-2.5 cm. latis, apicibus rotundatis, depressione 

 erescente parva, costa prominente, caecostomatibus 250-300 in quoquo 

 cm. quadrato, siccatis minute papillosis ; receptaculis complanatis, 

 4—7 em. longis, indistincte definitis. 



Growing in quiet water on boulders in the lower littoral belt. Near 

 Bellingham, Washington. 



Type, Gardner, no. 2335 (Herb. Univ. Calif., no. 201189), July, 

 1910. 



A dried fragment of a plant of this form is shown on plate 15. 

 The form seems to be quite distinct from all others. Its color, its 

 rigid, cartilaginous consistency, its relatively wide fronds, its large 



