119. Lecidea] 33. LECIDEACEAE 205 



66. Lecidea gelatinosa Floerke, Ges. Naturf. Freund. Mag. 3:201. 1809. 

 Biatora viridescens var. gelatinosa (Floerke) E. Fries. 



Thallus moderately thick, composed of minute, smooth and sometimes powdery, 

 ashy to greenish gray granules passing into a continuous crust or tending to dis- 

 appear; apothecia small to middle-sized, 0.3-0.7 mm. across, adnate, often clus- 

 tered and irregular, the disk flat to convex, black, the exciple thin, pale lead-colored, 

 soon disappearing; hypothecium hyaline to brownish; spores ovoid to ovoid- 

 ellipsoid, 7-11 X 4-5.5 ix. 



On rotten wood, New Hampshire and New Jersey. 



67. Lecidea panaeola Ach., Vet. Akad. Nya Handl. 267. 1808. 

 L. leucophaea (Floerke) T. Fries. Biatora leucophaea Floerke. 



Thallus moderately thick, granulose, widespread, ashy gray, the granules some- 

 what raised and irregular, scattered or continuous, often becoming verrucose- 

 areolate; hypothallus black; apothecia small to middle-sized, 0.3-1 mm. across, 

 partly immersed to adnate, the disk flat to slightly convex, dark brown to black, 

 whitish within, the exciple thin, often lighter, finally disappearing; hypothecium 

 hyaline to pale brownish; spores oblong-ellipsoid, 10-15 X 6-8 /x. 



On rocks, New Hampshire and Minnesota. 



68. Lecidea pantherina (Hoffm.) Ach., Meth. Lich. 37. 1803. 



Verrucaria pantherina Hoffm., Deutschl. Fl. 184. 1796. L.lactea (Flotj Schaer. 

 L. variegata E. Fries. 



Thallus moderately thick, ashy, varying toward whitish or greenish gray, 

 smooth, continuous, becoming roughened and chinky or areolate; apothecia small 

 to large, 0.4-1.5 mm. across, partly immersed to rarely adnate, the disk flattish, 

 black, often pruinose, the exciple also black, thin, becoming wavy, often finally dis- 

 appearing; hypothecium brownish; spores ellipsoid, 9-14 X 5-8 /jl. (Plate 15 a.) 



On rocks, Minnesota. 



69. Lecidea arctica Sommerf., Suppl. Fl. Lapp. 156. 1826. 

 L. arctica var. pallida Tuck. 



Thallus widespread, granulose, brownish ash-colored, the granules minute, 

 globular, at first scattered, then heaped; apothecia small, 0.4-1 mm. across, im- 

 mersed, sometimes conglomerate, the disk strongly convex to hemispherical, round 

 to irregular, black, thinly gray-pruinose, the exciple soon disappearing; hypothe- 

 cium brownish; spores oblong-ellipsoid, 12-24 X 7-9^. 



On rocks, New Hampshire, Colorado, and Washington. 



70. Lecidea lugubris Sommerf., Suppl. Fl. Lapp. 143. 1826. 



Thallus thick, widespread, tough, squamulose, reddish brown to blackish gray, 

 the squamules becoming lobed, crowded, often breaking up into granulose areas; 

 hypothallus black; apothecia middle-sized, 0.5-1 mm. across, sessile, the disk flat, 

 black, the exciple blackish, thick, raised, sometimes flexuous; hypothecium brown- 

 ish; spores globose, 6-9 ^ across. 



On rocks, New Hampshire. 



71. Lecidea cinerata Zahlbr., Bull. Torr. Club 27:644. 1900. 



Thallus white, absent except under the apothecia; apothecia small, 0.4-1 mm. 

 across, adnate, more or less clustered, the disk concave to flat, round, angular or 

 flexuous, black, at first lightly pruinose, the exciple thick, raised, ashy pruinose; 

 hypothecium brown; spores 12-14 X 5-6 /a. 



On disintegrated granite, southern California. 



