32 University of California Publications in Botany [Vol. lo 



study much more extensively in the same general locality. As reported 

 in Setchell and Gardner {Inc. cii .) , it was found growing on sand 

 rocks. It is (|uite common on the sand rock ledges of that vicinity, but 

 I have learned that its normal habitat is farther down in the littoral 

 belt than was first reported. There were Imt a few plants growing in 

 the first locality mentioned, on a ledge in the upper littoral belt, but 

 in a shaded location. The majority of the specimens were very much 

 dwarfed. The average height in their normal habitat is about 16 cm., 

 although some specimens were found up to 32 cm. high. Gardner, 

 no. 2336a, plate 26, represents a fruiting plant of medium height from 

 this collection. 



Fucus membranaceus sp. nov. 



Frondes magnitudine variabiles parvae vel usque ad 4 dm. altae. 

 manifeste membranaceae, obscure olivaceo-brunneae vel superne 

 luteolae ; segmentis linearibus vel paullo cuneatis, strictis. alls mera- 

 branaceis, costa comparative parva distincta et percursa, crypto- 

 stomatibus sparsis, plerumque ad segmenta tt^rminalia et subterminalia 

 dispositis. comparative parvis in sicco papillosis. receptaculis vulgo 

 complanatis, partim inflatis, bifidis aeuminatisque. 



Growing in the littoral bolt. From the Bering Sea to Puget Sound. 

 Washington. 



For a discussion of this species major see page 11. 



Fucus membranaceus f. abbreviatus f. nov. 



Plate 27 



Frondes breves, membranaceae, flabelliformes, deconipasite dicho- 

 tomo ramosissimae, 8-14 cm. altae ; segmentis strictis, anguste cuneatis 

 vel sublinoaribus. 5-9 mm. latis. apice truncatis. costa panmi promi- 

 nente paululum evanescente, alls tenuibus cryptostomatibus in seg- 

 mentis terminal ibus 20-40 in quoque cm. quadrato, ad partem frondis 

 inf eriorem paucis, parvis siccatis evidentioribus ; receptaculis bifidis, 

 plerumque muco inflatis. apice acuminatis aut truncatis, paullo divari- 

 catis distincte definitis; conce])taculis numerosis, promincntibus. 



Growing on rock ledges exposed to heavy surf, in tlu' ui)])(M' limit 

 of the littoral belt. Sitka, Alaska. 



Type, Gardner, no. 3995& (Herb. Univ. Calif., no. 201192 V -Tiily. 

 1917. 



Forma abbreviatus grew on the same islet on wliidi forma acnm- 

 i)iatus was found growing, but mostly higher up. some specimens were 

 even above menn high-tide level. Tt differs from forma nnn)iiiiaf}(!< 



