— 79 — 



been unable to visit the ranges lying further eastward where one may confidently 

 expect a considerable increase to the tentative list of 124 names herewith ap- 

 pended : 



Verrucaria nigrescens Pers. Rare; on Sumas Mt. at 2500 feet. Speci- 

 mens not typical, spores g}4-io by i6}4--22fx. 



Verrucaria pulverulenta Ach. Occurring with Graphis scripta on bark 

 in the lowlands. 



Calycium hyperellum Ach. Abundant on the trunks of Pseudotsuga 

 mucronata, along the upper portions, 50 feet and more from the ground. 



Calycium polyporaeum Nyl. On a Polyporus, Sumas Mt., at 2000 feet. 



Cyphelium inquinans (Sm.) Trevis. Abundant on lower portion of trunks 

 of large specimens of Pseudotsuga mucronata; throughout the lowlands; spores 

 smaller than I find them elsewhere, 8 by 11-13.5//. Also occurring on old cedar 

 rails and posts. 



Sphaerophorus globosus (Huds.) Herre. Abundant on tree trunks; 

 slopes of Mt. Baker, 1000 to 4000 feet. 



Arthonia radiata (Pers.) Th. Fr. Common on trees in the lowlands. 



Arthonia radiata var. swartziana (Ach.) Willey. On bark of Acer 

 circinatum. 



Opegrapha varia Pers. Very abundant on the trunks of large specimens 

 of Populus trichocarpa along the Nooksack river, and also on Acer macro phyllum 

 in the forested lowlands. 



Graphis scripta (L.) Ach. Very common on various smooth barked trees. 



Graphis scripta pulverulenta Ach., and other varieties also occur. 



Thelotrema lepadinum Ach. On alder, Sumas Mt., at 1600 feet. 



Lecidea sanguineo-atra (Wulf.) Ach. On Pseudotsuga mucronata. 



Lecidea rubiformis Wahlenb. On earth and rocks; Mt. Baker, at 600a 

 feet. Spores small, 4 by 6 S-S^. 



Lecidea contigua Fr. On Mt. Baker above the snow line; specimens not 

 typical; spores sub-globose, ovoid ellipsoid, and ellipsoid, 7K~i2>^ by 12-20^1. 



Lecidea tessellata Flk. On rocks, Mt. Baker; poorly developed. 



Lecidea arctica Sommerf. On dead moss, Mt, Baker, 6000 to 7000 feet. 

 Spores 8 by 13-16/x, with conspicuous oil drops. 



Lecidea rivulosa Ach. Mt. Baker above snow line; occurring on dead 

 moss, in very tiny patches mixed with other lichens. 



Lecidea parasema Ach. Common on various trees in the lowland. 



Lecidea anthracophila Nyl. The late Dr. Hasse and myself both placed 

 this specimen here though the spores are short for the species. On a charred 

 stump at 2000 feet elevation, Sumas Mt. 



Megalospora sanguinarius (L.) Th. Fr. Occasional on bark of Douglas 

 spruce in the lowlands. 



Bacidia albescens (Anzi) Zwackh. On the shaded side of Sambucus 

 and on Douglas spruce; spores 1.4-2.7 by 38-44/i. 



Bacidia fusco-rubella (Hoffm.) Arn. On Sumas Mt.; spores 2.5-3 by 

 47-72M. 



