Howe: American Species of Alectoria 



143 



tenace, semitrasparente ; rami di dicotomia in dicotomia assotti- 

 gliati, gli ultimi capillari. Apoteci laterali, sessili, orbicolari od 

 allungati, piano-convessi, di due millimetri di diametro, di color 

 fosco nereggiante nel disco. Sporidii ellittico-rotondati di tre in 

 quattro centimillimetri di lunghezza, di color castagno fosco, quasi 

 visibili ad occhio nudo." 



Specimens Examined 

 Labrador: Fox Harbor, A. C. Waghorne, Sept. 16, 1891 

 (NY) ; Black Bay, W. Palmer, Aug. 5, 1887 (NY). Ungava: 

 Diggs island, R. Bell, 1885 (CGS). Greenland : (NY). Alaska: 

 Unalaska, W. A. Setchell, June, 1899 (CEC) ; Unalaska, /. H. 

 Bean, Oct. 1, 1880 (NH) ; Cape Nome, W. A. Setchell, July, 

 1899 (NH). 



Alectoria osteina Nyl. Flora 1. c. 



Alectoria ochroleuca f. osteina Nyl. Synop. 1. c. 

 Type: No. 6947, coll. Galeotti. 



Type locality : Mt. " Orizaba, altit. 10,000 ped.," Mexico. 



Original description: " sistere meam A. osteinam Cornicu- 

 laria laeta Tayl. . . . , C. lata Tayl. . . . ; sed nil neque laetum, 

 neque latum habet haec species," Flora 41 : 378. 1858. 



" Variat dein forma minore osteina Nyl. . . . thallo magis 

 albido," Synop. 282. 1858-60. 



Diagnosis : Thallus erect, pale virescent, branches rigid slender, 

 subterete, and Cladoniform. 



Description : Thallus erect, rigid, subterete, Cladoniform, 

 pale virescent ; cortex glabrous, dull, striate ; primary branches 

 subterete, slender, dichotomous (max. length 6 cm.) ; secondary 

 branches terete, slender, dichotomous ; fibrils terete, minutely 

 slender, furcate. Apothecia small (max. diam. 1.5 mm.), con- 

 cave, innate, margins entire, incurved, disk chestnut to dark 

 brown. Spores as in ochroleuca. 



Substrata : on the earth. 



Geographical distribution : Mexico, Mt. Orizaba and Toluka 

 {Stizenberger) . 



Observations: This plant appears to be a reduced slender, 

 alpine form otherwise strongly resembling ochroleuca, of which 

 by Nylander himself it was once considered a form. I have only 

 been able to examine one authentic specimen (TH) from our 



