104 LICHENS OF THE STATE OF WASHINGTON 



On soil: Washington Territory, 1883, Suksdorf 225 (T). Fink (1935) 

 reports this species from Washington. 



5. Biatorella morijormis (Ach.) Th. Fr. Lich. Scand. 1 :401. 1871-74. 

 Arthonia morijormis Ach. Syn. Lich. 5. 1814. 

 Biatora morijormis (Ach.) Tuck. 



Thallus grayish white, greenish gray, or brownish gray, indistinct, thin, 

 effuse, smooth, or sometimes granulose and scurfy, often disappearing 

 entirely. Apothecia circular, 1-3 mm. in diameter, adnate; disk dark brown 

 or black, flat to slightly convex ; proper margin soon disappearing ; hypothe- 

 cium hyaline; spores hyaline, spherical, nonseptate, 1.0-3.5 ju, in diameter. 



On bark of trees or decaying wood: Washington Territory, 1882, 

 Suksdorj 115 (T). Fink (1935) reports this species from Washington. 



44. Acarospora Mass. Ricerch. Auton. Lich. 27. 1852. 



Thallus uniformly crustose, squamulose, or areolate, often marginally 

 lobed, dorsi-ventral, with a distinct upper cortex, algal and medullary lay- 

 ers, sometimes the medulla is lacking, and with or without a more or less 

 distinct but thin lower cortex, attached to the substratum by hyphal 

 rhizoids. Apothecia one to several in each areole, circular or irregular in 

 shape, usually immersed, rarely sessile ; thalline margin present ; hypothe- 

 cium hyaline, rarely dusky; paraphyses unbranched, coherent or distinct, 

 occasionally slimy ; asci many-spored ; spores very numerous, usually more 

 than 100, very small, hyaline, nonseptate. 



A. Thallus some shade of yellow. 



B. On soil, usually sulphur color, indeterminate 2. A. Schleicheri 



B. On rock, bright lemon color, determinate Z.A. jiava 



A. Thallus not some shade of yellow. 



C. Lower surface of squamules pale brown, thalline margin broad. 



4. A. IVashingtonensis 



C. Lower surface of squamules very dark brown or black, thalline margin 



thin 1. A. juscata 



1. Acarospora juscata (Nyl.) Arn. Verhandl. Zool.-Bot. Gesellsch. Wien. 

 20 :528. 1870. 



Lichen juscatus Schrad. Spicil. Fl. German. 83. 1794. 

 Lecanora juscata (Schrad.) Rohl. 



Thallus light or dark brown, reddish or yellowish brown, indeterminate, 

 consisting of squamules, often clustered and areolate, or scattered and 

 lobate, smooth, opaque, or shiny, edges usually free from the substratum, 

 and raised ; below dark brown or black. Apothecia numerous, usually soli- 

 tary, but sometimes several in each areole or squamule, minute, 0.2-0.5 mm. 

 in diameter, immersed; disk darker than the thallus, often almost black, 

 punctiform, then concave to flat, smooth or slightly rough ; thalline margin 

 thin, disappearing; hypothecium hyaline; paraphyses coherent; spores 

 hyaline, oblong to subspherical, nonseptate, 4.0-5.0 x 1.0-2.0 fx. 



