225 



Evernia Richardsonii (Hook.) Nyl., Mem. Soc. Imp. Sic. 



Nat., Cherb. 5: 99. 1858. 

 Platysma Richardsonii (Hook.) Nyl., Synop. Lich. 306. 

 1858-60. 



Type: In the Kew Herbarium, Royal Botanic Gardens, Kew, 

 London. Cotype in the Herbarium Boston Society 

 Natural History, Boston, Mass., from Ft. Enterprize, 

 Canada, also in Herbarium of Wellesley College, Wellesley, 

 Mass., Herbarium Harvard University, Cambridge, Mass. 



Type locality: "Barren Grounds from Punt Lake to the 

 Arctic Sea." 



Original description: "thallo brunneo omino libero: laciniis 

 dichotomis linearibus, apotheciis marginalibus flavescenti- 

 brunneis." L. c. 



Figure: Rich. App. Frankl. Narr., etc. PI. 31. 1823. 



Elenkin & Savicz, List Lich. coll. Yakutsk & Maritime Prov. 

 by M. TscherolefT, etc. PI. 10. 1903. 



Diagnosis: Phallus everniiform, subcanaliculate, brown, mar- 

 gins entire. 



Description: typical: Phallus fruticose, everniiform (max. 

 alt. 16 cm.), rigid, brown; cortex glabrous, ecorticate here 

 and there on the concave face; branches bifacial, divari- 

 cate, dichotomous above (max. width 9 mm.), margins 

 entire. Apothecia rare, adnate, marginal, ample (max. 

 diam. 9 mm.), convex, margins crenulate, disk yellowish- 

 brown. Spores 6-6.5 X 4-6 ^u. 



Contingent phases: Unobserved. 



Substrata: On the earth and on the dung of Rangifer arcticus. 



Distribution: Common in the Boreal zone from Chesterfield 

 Inlet, Hudson Bay to Dawson, Yukon. Dr. Eckfeldt 

 recorded it from Newfoundland but his herbarium is 

 without material from this island. No. 105 of Canadian 

 Lichens distributed by J. Macoun from Mt. Aylmer, B. C. 

 (8,000 ft.) and determined doubtfully as Cetraria odentella 

 appears to be abortive or degenerate material of this 

 species. 



Observations: This little known arctic lichen is easily recog- 



