PART I., ADDENDA AND CORRIGENDA 
Page 9. Chenotheca melanophea Zwackh, inseri— 
Var. flavocitrina Paulson in Journ. Bot. lv. p. 195 (1917).— 
Thallus granular, effuse, varying in colour from cinereous-grey to 
deep-yellow. Apothecia numerous, similar in structure to those 
of the species. 
This lichen was found spreading widely on oak and ash trees and 
also on dead ivy stems where it showed as a deep-yellow film. The 
whole colouring was in places deep enough to suggest var. ferruginea, 
but the apothecia have longer stalks than in that variety and the 
habitat ‘‘on trees”’ is different. The reaction with potash, as in the 
species, is purplish-red due to the presence of salazinic acid, and the 
woody tissues in contact with the lichen take the stain the most 
deeply. The hyphe are generally unaffected. 
Hab. On bark of trees.—B. M. Bricket Wood, near St. Albans, 
Herts. Collected by R. Paulson, May, 1917. 
Page 23. For Spherophorus globosus A. L. Sm., read 8. globosus 
Wain. Exp. Antarct. Belge, Lich. p. 35 (1903). 
Page 26. 
After Order XV., insert XVA. CHRYSOTHRICACEA. 
Page 35. Under Ephebe lanata, Hab., add rarely on trees. 
(Note supplied by W. Watson, Taunton.) 
Page 42. Add 4. Psorotichia lugubris Dalle Torre & Sarnth. 
Flecht. Tirol. p. 592 (1902). Lecidea lsgubris Sommerf. 
Part 2, p. 16: 
This species was doubtfully included under Lecidea. The late 
Mr. W. West, to whom a specimen was submitted, determined the 
gonidia as Gloeocapsa alge. 
Page 47. After Physma chalazanum, insert— 
2a. Ph. chalazanellum A. L.Sm. Similar to Ph. chalazanum 
but with smaller thallus and apothecia, the latter -2 mm. in 
diam. and spores 12-19 p» long, 6-10 pw thick.—Collema chalaza- 
nellum Nyl. in Flora lix. p. 231 (1876) ; Wats. in Journ, Bot. lv. 
p- 109 (1917). 
Hab. On limestone wall near Taunton, Somerset. 
