Howe: American Species of Alectoria 



117 



rect. His inference and Nylander's was based no doubt on in- 

 sufficient material, which in this case easily leads one astray. 



Specimens Examined 

 Oregon: Benton Co., E. Hall, 1871 (NH) ; Tillamook, T. 

 Howell, Oct. 30, 1882 (ANS) ; Dalles, /. W. Eckfeldt, 1880 (74 

 CGS). Washington: Westport, no. 82 Lich. Exsic. Merrill, A. 

 S. Foster, Jan. 25, 1908 (6304 F). British Columbia: Mt. 

 Benson, 3,300 ft., Vancouver, Macoun, July 10, 1892 (CGS) ; 

 Kootanay Lake, 5,000 ft., Macoun, July 9, 1890 (CGS). Cali- 

 fornia: San Gabriel mts., H. E. Hasse, Aug., 1896 (Hasse distri- 

 bution) ; Wawona, C. E. Cummings, May 16, 1896 (No. 212 

 Decade No. Amer. Lich. and No. 142 Lich. Bor. Amer.) ; San 

 Jacinto mts. (Krypt. Exsic. Zahl.) ; Stanford, 400 ft., A. C. 

 Herre, Oct. 1, 1903 (ACH) ; Mt. View Landing, A. C. Herre, 

 Sept. 30, 1903 (ACH) ; Alpine creek canon, 2,000 ft., A. C. 

 Herre, Apr. 5, 1905 (ACH) ; Waddell creek, 1,400 ft., A. C. 

 Herre, June 29, 1906 (ACH). 



Alectoria divergens (Ach.) Nyl. Synop. Lich. 278. 1858-60 



Cornicularia divergens Ach. 1. c. 



Type : not indicated, but the specimen on which the species was 

 based is in the Acharian herbarium, Universitetets Botaniska 

 Institution, Helsingfors, fide Prof. Dr. F. Elfving. 



Type locality : " alpibus Lapponicis. Wahlenberg." 



Original description: "thallo cartilagineo effuso subcaespi- 

 toso glabro fusco-castaneo, ramis compressiusculis subangulosis 

 scabriusculis elongatis laxis divergentibus flexuosis dichotomis 

 attenuatis, apice longe furcellatis curvatis. (Apothecia ignota.)" 

 Meth. Lich. 2 : 303. 1803. 



Figure: Acharius, Meth. Lich. 1. c. pi. 6. f. 1. 



Diagnosis : Thallus chestnut-brown, caespitose, filamentous, 

 stout, rigid, apices furcate. 



Description : Thallus caespitose or procumbent, filamentous, 

 stout, rigid, chestnut-brown, branches subterete ; cortex glabrous, 

 or generally nitidous, often rimulose, exposing white medulla ; 

 primary branches dichotomous, subdivaricate (max. length 14 

 cm.) ; secondary branches dichotomous, divaricate; fibrils flexu- 

 ous, furcate. Apothecia lateral medium sized (max. diam. 9 



