138 23. GYALECTACEAE [79. Microphiale 



79. Microphiale Zahlbr., in E. & P., Nat. Pfl. 1:125. 1907. 



Thallus crustose, very thin, smooth to scurfy, sometimes disappearing, partly 

 within the substratum, rudimentary, rarely snowing differentiation; apothecia 

 minute to small, adnate to sessile, the disk more or less concave to flat, pale flesh- 

 colored or yellowish orange or red, the exciple thick, colored like the disk, some- 

 times striate, often surrounded by a thin, soon disappearing, thalloid one; 

 hypothecium hyaline; hymenium hyaline or brownish above; paraphyses un- 

 branched; asci clavate to cylindrico-clavate; spores 8, hyaline, fusiform-ellipsoid, 

 1 -septate. 



The algal host is Trentepohlia. 



A. Thallus greenish gray to ashy; apothecia pale yellow to yellowish orange 1. M.lutea 

 A. Thallus greenish to grayish white or lead-colored; apothecia 



pale flesh-colored to yellowish red 2. M. diluta 



1. Microphiale lutea (Dicks.) Zahlbr., Sitzunb. Kais. Acad. Wiss. Math. Nat. 



Class. Wein. 111:392. 1902. 

 Lichen luteus Dicks., PI. Crypt. Brit. 1:11. pi. 2, f. 6. 1785. Gyalecta lutea 



(Dicks.) Horn. 

 Thallus thin, smooth to scurfy, greenish gray to ashy, sometimes disappearing; 

 apothecia minute to small, 0.2-0.6 mm. across, sessile, the disk concave to flat, pale 

 yellow to yellowish orange, the proper exciple lighter, becoming striate, bordered 

 by a thin, disappearing, thalloid one; spores fusiform-ellipsoid, 8-12 X 3-4.5 /x. 

 On trees, from New England to Florida, and westward to Nebraska and Minne- 

 sota. 



2. Microphiale diluta (Pers.) Zahlbr., Ann. Naturhist. Hofmus. Wein. 19:413. 



1904. 

 Peziza diluta Pers., Syn. Meth. Fung. 668. 1801. Gyalecta Pineti (Schrad.) 



Tuck. 

 Thallus very thin, smooth to scurfy, greenish to grayish white or lead-colored; 

 apothecia minute, 0.15-0.45 mm. across, sessile, the disk deeply to slightly con- 

 cave, pale flesh-colored to yellowish red, the proper exciple thick, colored like 

 the disk; spores fusiform-ellipsoid, 10-13 X 3-4.5 fx. 



On trees, from New England to Florida, and westward to Illinois. 



80. Gyalecta Ach., Lich. Univ. 30. pi. 1, f. 7-9. 1810. pr. p. 



Thallus crustose, thin, smooth to chinky, granulose or powdery, sometimes 

 disappearing, partly within the substratum, rudimentary, rarely showing differenti- 

 ation; apothecia minute to small or rarely middle-sized, adnate to subsessile, the 

 disk more or less concave, flesh-colored to reddish brown, the exciple colored like 

 the disk, sometimes surrounded by an inconspicuous, soon disappearing, thalloid 

 one; hypothecium hyaline; hymenium hyaline or rarely brownish above; paraph- 

 yses unbranched; asci cylindrico-clavate; spores 8, hyaline, ellipsoid to ovoid- 

 ellipsoid, transversely and longitudinally septate, the cells cylindrical. 



The algal host is Trentepohlia. 



A. Thallus greenish gray to whitish; apothecia flesh-colored to red . . 1. G. jenensis 

 A. Thallus grayish to whitish; apothecia flesh-colored 2. G. Flotowii 



1. Gyalecta jenensis (Batsch.) Zahlbr., Cat. Lich. Univ. 2:720-724. 1924. 



Peziza jenensis Batsch., Elench. Fung. 219. f. 153. 1786. Secoliga cupularis 

 (Hedw.) Norm. G. cupularis (Hedw.) Schaer. 



Thallus very thin, smooth to scurfy, greenish gray to whitish; apothecia minute 

 to small, 0.25-0.5 mm. across, adnate to subsessile, the disk concave, flesh-colored 



