Rev. W. A. Leighton on the British Graphideae. 4i3 



in the centre, smoothish, dull. Sporidia in asci, eight, of a very 

 peculiar form, slenderly clavseform, round at the extremities, 

 3-septate, pale yellow. 



Plate VIII. fig. 39. a, Vertical section of thallus and ardella; 6, sporidia ; 

 c, thallus and ardellse, nat. size. 



9. Coniocarpon, DC. 



Apothecium (ardella) appressed, rotundato-deformed or elon- 

 gate, sessile, covered with a subcartilaginous membrane which 

 ultimately breaks up into a fine powder, within subgelatinous, 

 containing a series of pyriform asci ; perithecium none ; disk 

 plane, depressed, not bordered, pruinose. Thallus crustaceous. 



Name from /covt?, dust, and Kap7rb<;, fruit. 



This genus has in reality precisely the same structure as that 

 of Arthonia, but it is retained separate on account of the peculiar 

 property of the upper surface of the ardellse breaking up into 

 powder, which I have never observed to happen in any of the 

 species of Arthonia. 



Mr. Borrer {in litt. 1852) remarks, " The surface of the apo- 

 thecium in Lecanactis hjncea and in Arthonia impolita sometimes 

 becomes powdery. I suspect that both in that state have passed 

 for Coniocarpon nigrum, DC, Spiloma variolosum, Ach., S, nigrum, 

 Lich. Brit.^' &c. 



1. Coniocarpon cinnabarinum, DC. Thallus filmy, thin, gray- 

 ish, determinate ; ardellse sessile, clustered, shapeless, solid ; disk 

 plane, depressed, lurid and pruinose, or powdery and of a bright 

 vermilion; sporidia in asci, eight, obovato-clavate, rounded at 

 the extremities, 4-septate, the upper cell largest, pjale red. 



" SpJioeria gregaria, Weigel, Obs. Bot. 43. t. 2. f. 10." (1772); Dicks. 



Crypt. 1. 22; With. Fl. Brit. 4. 391 ; « Sowerb. Fung. t. 375. f. 5," 

 Lichen impolitus, Sm. E. Bot. t. 981 (1802). 

 " Coniocarpon cinnabarinum, DC. Fl. Frany, 2nd ed. 323; " Fee, Crypt. 



tab. 1. f. 10 (1824); Fries ! L. Reform. 379; Summa V. Scand. 118. 

 Spiloma tumidulum, Ach. Meth. 11. t. 1. f. 5 (1803) ; Sm. E. Bot. t. 2161 j 



Johnst.! Berw. 101 ; Moug. & Nestl. Stirpes, 651 ! 

 tumidulum ec. 8f 13, L. Univ. 136 (1810); Syn. 1 ; Hook. Fl. Scot. 2. 



35; Grev. Fl. Edin. 324. 

 Arthonia tumidula, Ach. in Schrad. N. Journ. Bot. 1. 3. p. 11 (1806). 

 Spiloma gregarium. Turn. & Borr. Lich. Brit. 42 (1813); Hook. Br. Fl. 2. 



167; Tayl. Fl. Hib. pt. 2. 77. 

 Conioloma coccineum, Mart. Erlang. 284 (1817). 

 Coniocarpon gregarium, Schar. Spicil. 223 (1823-1836); Enum. 242. t. 9. 



f. 5; Exsic. 239! 

 Arthonia cinnabarina, Wallr. Crypt. Germ. 320 (1831). 



" Thallus forming roundish patches of 1-2 inches in diameter, 



