56 University of California Publications in Botany [Vol. lo 



No. 5652 (Herb. Univ. Calif., no. 99101) from St. Michael, Alaska, 

 quoted above, is as near the type as could be desired in every particular. 

 The plants are about 10 cm. high, thus representing the upper limits 

 in size as stated by Kjellman. The plants under the other numbers 

 referred to are all larger in all parts than the measurements given 

 by Kjellman, but they seem too closely linked to the type to warrant 

 separation without further study of quantities of material in the field. 

 There is not the sudden widening of the receptacles in any of the 

 latter forms as in the type. The receptacle character seems more 

 closely allied to that of f. microcephalus. 



Fucus evanescens f. angustus Kjellm. 



"Fuci evanescentis forma thallo subdichotomo, usque 20-30 ctmr 

 alto et 4—5 mm. lato, coriaceo vel coriaceo-membranaceo, costa inferne 

 valida, versus apicem sensim evanescente, in thalli partibus summis 

 vix eonspicua vel inconspicua, segmentis linearibus vel cuneato-linear- 

 ibus, elongatis, cryptostomatibus numero variantibus. parum prominent- 

 ibus, receptaculis minutis, oblongis, ovatis vel late ellipsoideis, obtusis 

 vel acutis, inflatis vel plus minus complanatis, scaphidiis hermaphro- 

 ditis, antheridiis interdum perpaucis; exsiccatione nigrescit. " 



' ' N. Ganse Cap ; Rogatschew Bay. ' ' 



Kjellman, Algenv. Murm. Meer, 1877, p. 27. 



This form of evanescens, first described by Kjellman, has not been 

 clearly identified with any specimens from our region, but is here 

 included because of its close resemblance to certain of our forms, and 

 hence the probability of its occurrence within our waters would seem 

 to warrant its inclusion. 



Yendo (1917, p. 16, pi. 1, fig. 1) identifies a plant of the Japanese 

 waters with this form. Setchell and Gardner (1903, p. 284) also 

 identified plants from East Sound and Fairhaven, Washington, with 

 this form, and specimens from East Sound were distributed in Collins, 

 Holden, and Setchell 's Phycotheca Boreali-Americana, no. 926. On 

 comparison of our plants with a sheet of plants in the Herbarium of 

 the University of California, no. 132699, collected on the Vega expedi- 

 tion near Tjapka and contributed and labeled by Kjellman, Fucus 

 evanescens f. angustus, it seems best to change the determination and 

 to place our plants under Fucus edentatus f. costatus. under which 

 a detailed account is given. The plants illustrated by Yendo difi'er 

 decidedly from the Kjellman specimens referred to above, particularly 

 in the size of the receptacles and the prominence of the midrib. It 

 may be doubted whether this form really extends so far south on 



