105. Leptogium] 28. COLLEMACEAE 165 



var. conchatum Tuck., Syn. N. A. Lich. 1:163. 1882. 

 Thallus tending toward unlobed conditions with the lobes gyrosely folded and 

 the margins slashed. 



Substrata and distribution as for the species. 



var. stellans Tuck., Syn. N. A. Lich. 1:163. 1882. 

 Thallus much narrower with the edges of the radiant lobes erect and curled 

 or wrinkled; spores becoming 7-9-septate transversely. 

 Substrata and distribution as for the species. 



14. Leptogium tremelloides (L.) S. F. Gray, Nat. Arr. Brit. PI. 1:400. 1821. 

 Lichen tremelloides L., Suppl. PI. 450. 1781. 



Transforming the algal colony into a middle-sized, suborbicular, closely adnate, 

 lead-colored, minutely coralline-granulose body, the lobes ascending, often imbri- 

 cated, with entire or finely undulate or dentate, irregular margins; often somewhat 

 lighter colored below; apothecia small to middle-sized, 0.5-1.7 mm. across, sessile 

 to shortly stalked, the disk slightly concave to slightly convex, brown, the algoid 

 exciple entire or irregular and colored like the thallus, sometimes disappearing; 

 hypothecium hyaline to brownish; spores ovoid-ellipsoid to ellipsoid-pointed, 3-5- 

 septate transversely and 2-septate longitudinally, 18-30 X 7-11 tt. (Plate 8.) 



On trees, from Maine to Florida, and westward to Texas and Washington, 

 var. azureum (Swartz) Nyl., Syn. Lich. 1:125. 1858. 



Lichen azureus Swartz, in Ach., Lich. Suec. 137. 1798. Collema tremelloides 

 var. cyanescens (Hoffm.) Ach. 



Thallus sky-blue, smooth to finally pitted, round and more regularly lobed. 



On trees and rocks, southern United States. 



15. Leptogium arizonicum Zahlbr., Bull. Torr. Club 35:299. 1908. 

 Transforming the algal colony into a small, imbricately lobed, olive-greenish 



to darker body, the lobes broad and entire or incised, ascending and slender; 

 apothecia middle-sized, 0.8-1.2 mm. across, sessile, the disk slightly concave to 

 convex, brown to dull blackish, the proper exciple thin, entire, usually darker than 

 the disk; hypothecium hyaline; spores ellipsoid to ovoid-ellipsoid, 3-septate and 

 finally submuriform, 18-27 X 7-12 //.. 



On basaltic cliffs, near Tucson, Arizona. 



16. Leptogium apalachense Nyl., Mem. Soc. Sci. Nat. Cherb. 5:334. 1857. 

 Collema apalachense (Nyl.) Tuck. 



Transforming the algal colony into a small to middle-sized, delicately wrinkled, 

 irregularly to radiately many, narrowly, usually convexly lobed, olivaceous body, 

 ascending at the margin; paler and slightly ridged below; apothecia small, 0.3-0.6 

 mm. across, scattered or clustered, immersed to sessile, the disk concave to flat, 

 reddish to reddish brown, the exciple thick, externally algoid and colored like the 

 thallus or becoming brownish, the algoid portion disappearing; hypothecium hya- 

 line; spores ellipsoid, 3-septate transversely and 1-septate longitudinally, 18-26 X 

 11-14.5 ft. 



On rocks, Georgia, Alabama, Tennessee, and Missouri. 



17. Leptogium juniperinum Tuck., Am. Journ. Sci. 28:200. 1859. 



L. tremelloides var. juniperinum (Tuck.) Hue. L. tremelloides var. microphyllum 

 Tuck. 



Transforming the algal colony into a small, minutely and wavy-lobed, rosette- 

 like, lead-colored to dark green body, the lobes ascending, much imbricated and 

 folded; apothecia small to middle-sized, 0.4-1 mm. across, sessile, the disk flat, 

 red to reddish brown, the algoid exciple thin, lighter colored to brown; hypo- 

 thecium brownish; spores ovoid-ellipsoid, 3-5-septate transversely and 1-septate 

 longitudinally, 15-22 X 7-9 /x. 



On soil, twigs, and rocks, from Massachusetts to Alabama, and westward to 

 Texas and Illinois. 



