1922] Gardner: The Genus Fuciis on the Pacific Coast 55 



here to the same form, though with some doubt. It is evidently a small 

 form and, according to Kjellman, grows in the sublittoral belt, an 

 unusual habitat for small forms, or even other forms outside of the 

 Arctic regions. It may be noticed from the illustration (plate 59) that 

 the Norton Sound specimens have a decided habit of growth which is 

 not very common among the forms of the genus, viz., one of the mem- 

 bers of a dichotomy develops into a receptacle, while the other con- 

 tinues to grow and forks one to several times before the receptacle of 

 the original dichotomy matures and disintegrates. This makes the 

 receptacle appear to have developed laterally. The illustration 

 (plate 58) of the type specimen does not show this character, prac- 

 tically all of the segments fruiting simultaneously. More study of 

 this character is highly desirable. 



Fuscus evanescens f. contractus Kjellra. 



"f. 5-10 cm. alta, fronde vix cauleseente, subirregulariter furcata, 

 segmentis subcoriaceis, infimis cuneato-linearibus. superioribus linear- 

 ibus, 3-5 mm. latis, apicibus truncatis ; costa inferne valida, promi- 

 nente, superne evanescente ; receptaculis limitatis, complanatis, minor- 

 ibus, ambitu ellipticis vel obcordatis; scaphidiis parvis. " 



"S:t Lawrence-on, temligen ymnig; nagot sallskaplig inom litoral- 

 regionen ; med reeeptakler. ' ' 



Kjellman, Om Beringh. Algflora, 1889, p. 31. 



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

 larly 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 moder- 

 ately 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. 



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. evan- 

 escens f. hursiger (cf. Setchell and Gardner, 1903, p. 285). 



Kjellman, loc. cit. ; De-Toni, Syll. Alg., 1895, p. 202 ; Setchell and 

 Gardner, Alg. N.W. Amer., 1903. p. 284. 



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 at the base of the 

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

 based. 



