LICHENS OF THE STATE OF WASHINGTON 29 



Thallus when moist dark olive green (R), when dry grayish black ; lobes 

 small, round, margins erect, undulate, surface granular. Apothecia 0.2-1.0 

 mm. in diameter, circular, scattered, adnate; disk brown, concave to flat; 

 thalline margin prominent ; hypothecium brownish ; spores hyaline, ellipsoid, 

 3-septate, muriform when mature, 17-25 x 8-12 fx. 



On soil or rock: Ferry Co.: between Curlew and Danville, 1773 ft., 

 1931, 1413. Washington Territory, Cascade Mountains, 1883, Brandegee 

 19 (T). 



4. Collema verruciforme (Ach.) Nyl. Memoir Soc. Sci. Nat. Cherbourg, 

 3 : 165. 1855. Collema jurvum var. verruciforme Ach. Lich. Univ. 650. 

 1810. 



Thallus when moist vivid green (R), when dry dark brown; lobes small 

 to minute, crowded, smooth, margins ascending, crenate. Apothecia minute 

 never more than 0.3 mm. in diameter, circular, immersed to adnate ; disk 

 reddish brown, deeply concave, blood red when moist; thalline margin 

 thick, brown when dry, greenish when moist ; hypothecium hyaline to pale 

 yellow ; spores hyaline, quadrangular or ellipsoid, becoming muriform, 

 11.0-21.0x7.6-11.4/*. 



On bark or old wood : Chelan Co. : shores of Lake Wenatchee, 1800 ft., 

 1931, 1063. 



20. Leptogium S. Gray, Nat. Arr. Brit. PI. 1 :400. 1821. 



Thallus foliose, or rarely fruticulose; gelatinous when moist, brittle 

 when dry; distinct cortex on the upper surface only, or on both surfaces. 

 Apothecia often lacking, very small, circular, immersed, adnate, or sessile; 

 proper margin present, thalline margin sometimes disappearing; hypothe- 

 cium hyaline to brownish; paraphyses unbranched, agglutinated; asci 8- 

 spored; spores hyaline, 1 -many-septate, or muriform. 



A Lobes narrow becoming involute tubular towards the tips. 



3. L.palmatum 



A. Lobes not as above. 

 B. Thallus small. 



C. Margins ascending, denticulate or fringed. 



D. Lobes densely crowded, forming a cushion-like mass, usually 



sterile 2. L. lichenoides var. pulvinatum 



D. Lobes not densely crowded, not forming a cushion-like mass, 



usually fruiting 1. L.lichenoides 



C. Margins somewhat ascending, undulate, sparsely, white pilose. 



4. L.pilosellum 



B. Thallus larger. 



E. Upper surface smooth, somewhat wrinkled 5. L.pulchellum 



E. Upper surface densely coralloid-granulose. 6. L.tremelloides 



