1925] SetcJieU-Gardner: Melanophyceae 695 



Yendo (1907, p. 16, })1. 1, fig. 1) identifies a plant of tlie Japanese 

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

 identify 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- 

 dition near Tjapka and contributed and labeled by Kjellman, Fucus 

 evanescens f. angustus, it has seemed 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 differ 

 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 

 either coast of the Pacific Ocean as was previously supposed, but its 

 occurrence farther north may well be expected. 



17. Fucus evanescens f. contractus Kjellm. 



Fronds 5-25 cm. high, slightly caulescent, subcoriaceous, irregularly 

 dichotomous or subsecund, dark brown to yellowish ; segments mostly 

 strict, cuneate-linear below, linear above, 3-10 mm. wide, apices 

 truncate, midrib distinct below, vanishing above, cryptostomata mod- 

 erately abundant, 15-20 per sq. cm., inconspicuous; receptacles com- 

 planate, distinctly delimited, 1.5-3.5 cm. long, ellipsoidal or obcordate, 

 single or bifid ; conceptacles few, but prominent. 



Growing in the littoral region. Bering Sea, Alaska. 



Kjellman, Om Beringh. Algflora, 1889, p. 34 ; De-Toni, Syll. Alg., 

 1895, p. 202 ; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 284 ; 

 Gardner, Genus Fncus, 1922, p. 55. 



Setchell, nos. 5239, 5252 (Herb. Univ. Calif., nos. 99097, 99101), 

 St. Michael, Alaska; McGregor, nos. 5673, 5679 (Herb. Univ. Calif., 

 nos. 99099, 99100), Golofin Bay, Alaska. Not Gardner, no. 90 (Herb. 

 Univ. Calif., no. 99096), Whidbey Island, Washington, sub F. 

 evanescens f. hursigcr (cf. Setchell and Gardner, 1903, p. 285), 



Kjellman does not mention in his description of this form the 

 decided and sudden difference between the width of the segments and 

 the receptacles which they bear. This difference makes the receptacles 

 appear stipitate, since they are over twice as wide as the base of the 

 segments. Presumably this is the character upon which the form is 

 based. 



