Howe: American Species of Alectoria 



131 



lin: Baffin Land, R. Bell, July, 1897 (CGS). Alaska: St. Paul 

 Island, /. M. Macoun, Aug. 18, 1892 (CGS). 



Alectoria jubata implexa (Hoffm.) Ach. Lich. Univ. 593. 



1810 



Usnea implexa Hoffm. 1. c. 134. 1795. 



Setaria trichodes Mich. Flora Bor. Amer. 2: 331. 1803. 



Alectoria t jubata f. minuscula Merrill, Bryologist, 14: 36. 191 1. 



Type: "Usnea implexa (Hb. viv. p. 453: U. implexa Hoffm. 

 Germ.") = Alectoriae jubatae (Wainio, Adj. 8, p. 116) lusus, 

 thallo tenuiore, quam in setacea Ach., cui habitu satis est similis, 

 basin versus cano, apice obscurato." Fide Wainio in Meddel. 

 Soc. Fauna et Flora fennica, 14: 12. 1886. 



Type locality : " Deutschland." 



Original description : " U. implexa, filamentosa decumbens 

 implexa, filis longis divaricatis simpliciusculis.)," Deut. Flora, 2: 



I34-I35- 1795- 



Figure: Schrad., Jour. Bot. 1 : pi. 3. /. 4. 1799. 



Sowerby, Eng. Bot. 27: pi. 1880. 1808. 



Fink, Lich. Minn. Contrib. U. S. Nat. Herb. 14: pi. 42. 1910. 



Diagnosis : Thallus pendulous, brown, branches terete, filiform 

 throughout. Apothecia brown. 



Description : Thallus pendulous, filamentous, lax, terete, 

 occasionally tortulous, brown to black, rarely paler; cortex 

 glabrous or nitidous, often ruptured with white soralia ; primary 

 branches dichotomous, slender (max. length 38 cm.) ; secondary 

 branches dichotomous, slender; fibrils capillaceous. Apothecia 

 lateral, rare, very small (max. diam. 2 mm.), convex, innate- 

 marginate, disk concolorous or pale brownish yellow. Spores as 

 in jubata. 



Contingent phases: (a) Thallus entirely or partially gray 

 (Alectoria jubata subcana Nyl. Jour. Bot. 14: 360. 1876), 

 (b) becoming virescent approaching A. virens Tayl., A. tortuosa 

 Merr. ? 



Substrata: As in jubata. 



Geographical distribution : Common throughout the Transi- 

 tion and Boreal zones. It extends in the east from North Caro- 

 lina (Curtis) to Labrador (Cummings and Eckfeldt) ; in the 

 west from San Quintin, Lower California, to Yukon and Alaska 



