lfl - 2 ] Gardner: The Genus Fuciis on the Pacific Coast 37 



figure 2, reduced 0.3. As may be seen, the illustration measures about 

 ten and a half centimeters long and the segments fourteen millimeters 

 wide. There is no holdfast portion, and the illustration appears to 

 be of only a part of a plant, hence the height of the whole plant cannot 

 be determined. The receptacles are complanate and are comparatively 

 short, conditions which are commonly met with in most forms of Fucus 

 when beginning to fruit. The receptacles of the plant from which the 

 illustration was made were thus probably immature. For a detailed 

 discussion of this species major see page 11. 



Fucus evanescens f . nanus Kjellm. 



"F. evanescentis forma thallo circa 5 ctmr alto, 2-3 mm lato, sub- 

 coriaceo, irregulariter dichotomo, segmentis linearibus vel sublinear- 

 ibus. vulgo elongatis, costa in partibus thalli superioribus saepius 

 obsoleta, receptaculis (in speciminibus nostris parum evolutis) vel 

 ovatis vel obovatis, dichotomis, interdum deorsum vix definitis. 

 Exsieeatione non nigrescit." 



"Green Harbour ad scopulos prope rivuli ostium jacentes in 

 superiore aquae limite, ut sub refluxu maris deuudaretur. Formas 

 hanc sum forma tvpiea connectentes in Mosselbay inveni. " 



Kjellman. Om Spetsb. Thall., II, 1877a, p. 4. 



Fronds minute, 4-5 cm. high, 2-5 cm. wide, without distinct stipe 

 and usually without holdfast, branching very irregularly, consider- 

 ably twisted, color variable, yellowish brown to olive green, fruiting 

 sparsely; segments extremely variable in shape and size, midrib 

 slightly developed below, usually vanishing above, cryptostomata few 

 or absent ; receptacles entire or bifid, ovate-ellipsoidal or with divergent, 

 blunt, or acuminate apices. 



Plate 37 



Growing mostly on mud flats at extreme high-tide limit, or even 

 considerably above, among various salt marsh plants, covered more or 

 less by fresh water. Takutat Bay, Alaska, to Puget Sound, Washing- 

 ton. 



Kev. Albin Johnson, no. 5712 (Herb. Univ. Calif., no. 99121), 

 Yakutat Bay. Alaska: Gardner, no. 2256 (Herb. Univ. Calif., no. 

 201154), Sitka, Alaska; T. C. Frye (Herb. Univ. Calif., no. 132931), 

 Tokeland, Washington. 



Kjellman (loc. cit.) ■ De-Toni, Syll. Alg., 1895, p. 203; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 285. 



After considerable observation in several different localities, I have 

 come to the conclusion that f. nanus cannot be considered as a distinct 

 form of any one species, but is in reality composed of a mixture of 

 dwarfed plants of whatever species or forms of species that happen to 



