26 University of California Publications in Botany [Vol. 10 



number of caeeostomata, its contorted and crisped habit of growth are 

 characters not found combined in any other known form. The plants 

 were found growing in great profusion, in good vegetative condition 

 in midsummer. The fruiting season apparently is in the winter, as 

 only a few well developed receptacles could be found. 



Fucus furcatus f. variabilis f. nov. 

 Plates 16 and 17 



Frons caulescens, superne foliacea, 25^0 cm. alta, subcartilaginosa, 

 dichotoma vel partim subsecunda, obscure olivaceo-viridis vel olivaceo- 

 brunnea, siccata atra, costa et receptaculis luteolis ; segmentis linear- 

 ibus vel paullo cuneatis, 2-3.5 cm. latis, plerumque supra axillas in 

 latere diminuatis, costa vale exposita, percursa, caeeostomatibus in 

 numero variabilibus, paucis usque ad 75 in quoquo cm. quadrato; 

 receptaculis forma et magnitudine variabilibus, manifeste definitis, 

 inflatns et mucosis vel complanatis, integris obtusisque vel 2-3-furcatis 

 acuminatisque. 



Growing on rock ledges in quiet bays in the middle of the littoral 

 belt. Sitka, Alaska. 



Type, Gardner, no. 3993 (Herb. Univ. Calif., no. 201219), July, 

 1917. 



A close relationship seems to exist between this form of F. furcatus 

 and F. evanescens f. rnagnificus. The color, caeeostomata characters, 

 and the rigid, more or less cartilaginous consistency of the fronds are 

 characters that belong to the furcatus group. The width of segments 

 and particularly the fruiting habit (see under F. evanescens forma 

 rnagnificus) are very similar to those of that form. The caeeostomata 

 vary much in number. In some specimens they are practically absent, 

 while in others there may be seventy-five or perhaps more to the square 

 centimeter. They are mostly large, deep-seated and inconspicuous on 

 drying, except by transmitted light. Specimens with but a few caeeo- 

 stomata usually have a few small cryptostomata. 



Fucus nitens sp. nov. 

 Plates 18 and 19 



Frondes paululum flaccidae, coriaceae, 30^0 cm. altae, regulariter 

 dichotomae, obscure brunneae vel luteolae, in sicco valde brunneae ; 

 segmentis strietis, 9-18 mm. latis, levibus nitidisque, cuneatis, ter- 

 minalibus latioribus, paullo ovatis, truncatis, puncto crescente parum 

 depresso, costa paullo prominente, eryptostomatibus nullis vel spar- 

 sissimis; receptaculis luteolis, juvenibus complanatis, saepe demum 

 tumidis, 2-3-furcatis, interdum usque ad 10 cm. longis ; conceptaculis 

 magnis. 



