

GYALECTA. 221 



8. G. Flotovii, Koerb. ; thallus thin, powdery ; whitish ; or 

 obsolete; apothecia minute, adnate, urceolate ; the disk flesh- 

 coloured; the coarctate, pale, sub-crenulate margin soon rounded. 

 Spores in eights; rounded and ovoid; from 4-locular (the cells 

 disposed crosswise) becoming muriform-plurilocular ; ?jj~jjj mic. 



Koerb. Syst. p. 171. Lecidea Querceti, Nyl. Scand. p. 191, 



fide Ohlert. 



On bark, Amherst, Tuckerman Gen. 1872. Not a Secoliga, 

 as defined by Koerber (Parerg. p. 109) but notwithstanding 

 nearest to G. abstrusa (Secoliga Koerb. I. c.) the spores of which 

 pass at once (Zw. exs. n. 90. Hepp. exs. n. 27) into more or less 

 muriform conditions, sometimes closely comparable with the 

 spores of the present. 



9. G. cupularis (Hedw.) Schaer. ; thallus tftin, at length 

 chinky; greenish-ash-coloured; apothecia superficial, urceolate 

 becoming more open; disk pale-brick-red; the white margin 

 radiately striate or cleft, but at length rounded. Spores in 



eights; ellipsoid; ^^mic. ScJwer. Spicil.p.79. Nyl. Scand. 



p. 189. 



Lime-rocks. Pennsylvania, Muhlenberg Catal. 1818. New 



York, Halsey. Vermont, Eussell. Alabama, Peters. So far 



as seen, our lichen has always small, pale, urceolate fruit, which 

 is scarcely cleft above, and is best comparable with Fr. Lich- 

 Suec. n. 401, in my copy: that of the European plant becomes 

 however much larger, more open, and with higher-coloured disk, 

 and the radiately-cleft margin is now very marked. 



* * Sagiolechia. Apothecia black. 



10. G. rhexoblephara (Nyl.) Tuckerm. ; thallus very thin; 

 whitish, or obsolete ; apothecia small to middling-sized, closely 

 sessile, explanate, the flat disk dark-rufous and blackening ; the 

 thick, elevated, persistent, black margin radiately cleft. Spores 



in eights; fusiform -ellipsoid ; 4-locular; ^J mic. Gyalecta, 



Tuckerm. Gen. p. 132. Lecidea, Nyl. Scand. p. 240. Rhexo- 

 phiale coronata, Th. Fr. Lich. Arct. p. 204. 



On the earth, growing over mosses, etc., Greenland ( Vahl), 



Th. Fries I c. 1861. Islands of Behring's Straits, Wright. 



The place of this curious lichen may perhaps be taken for satis- 

 factorily determined (as is suggested in the present writer's 

 observations above-cited) by that of G. protuberans (Ach.) Anz. : 



