1922] Gardner: The Genus Fucus on the Pacific Coast 7 



J. Agardh (1848, p. 209) quotes Chaniisso's Unalaska specimen and 

 Sinclair's San Francisco specimen under F. furcatus Ag., at the same 

 time reducing F. edentatiis De la Pyl. (1829, p. 84) to synonymy with 

 F. furcatus Ag. This seems to have been the beginning of the con- 

 fusion of the two species which has not, up to the present time, been 

 completely cleared up. 



Kuetzing (1849, p. 591) gives a brief diagnosis of the species as 

 follows: "F. phycomate linear! enervi piano furcato, digital!; carp- 

 omatibus terminalibus planis 1-1%'' longis, phycomate latioribus." 

 "Ad oras occidentals Americae borealis, ad Unalaschkam, Cali- 

 forniam." In Tabulae Phycologicae, 1860. plate 17, figure II, he gives 

 a diagram of a portion of a plant from " Unalaschka " which shows 

 the receptacles to be 3 to 4 cm. long and very sharply pointed. This 

 figure was probably sketched from a portion of the type material 

 collected by Chamisso and, although it differs considerably from 

 Agardh's figure (Icon. Ined.. pi. 14), it may well represent a more 

 typical portion of a plant than Agardh's. 



Ruprecht (1851, p. 346) has the following to say concerning F. 

 evanescens Ag. and F. furcatus Ag., mentioned above : 



Ueber Funis evanescens unci furcatus kann ich jetzt, nacli Einsicht der 

 Original-Exemplare in Chamisso 's Herbarium, ein sicheres Urtheil abgeben. 

 Der erstere ist ein hochst unbedeutende, keineswegs bestandige Form von E. 

 vesiculosa und kommt nieht selten unter den Ocliotskisehen Exemplaren vor; 

 die an den Fruchtzweigen verschwindende Blatt-Rippe bezeiclmet diese Form 

 am wenigsten; Chamisso 's Pflanze stammt von Eedowski, von der Westkiiste 

 der Ochotskischen Meeres, nicht aus Kamtschatka. 



Fucus furcatus C. Ag. ist eine selbstandige Art, wachst aber nicht bei 

 Unalaschka, sondern in Nord-Californien bei Ross, woher ich neuerdings niehrere 

 Exemplare sah. Von eben daher hat auch, nach meinem Dafiirhalten, Chamisso 

 seine Pflanze mitgebracht; die beigelegte Etiquette mit "Kamtsch?" bezeichnet, 

 beweist, dass er selbst iiber ihren Fundort im Zweifel war. 



Fucus furcatus J. Ag. (Sp. Alg. I, p. 209) ist ein ganz andere Tang (eine Var. 

 von H. vesiculosa?), als die gleichnamige, in den Icon. Alg. ined. Tab. 14 

 abgebildete Original-pflanze. 



Harvey (1862, p. 163) again ascribes F. furcatus Ag. to the Pacific 

 Coast in determining Lyall's collections from Vancouver Island. He 

 remarks {loc. cit.) : "My F. Wrightii from Japan scarcely differs. 

 I fear tliat neither ought to be regarded as other than local varieties 

 of F. vesicidosus, which sometimes, even in Europe, occurs with as 

 narrow fronds. The elder Agardh's figure above quoted," that is, 

 Icon. Ined., pi. 14, "is worthless as a guide to the species described by 

 J. Agardh." Fucus Wrightii is now known to bo a species of Pelvetia 



