ZOOLOGICAL AND BOTANICAL ASSOCIATION. 277 



4. G. inusla(Ach. y Nyl.). G. Smithii (Leight., Mon. Br. Graph.). Very 

 common (especially var. divaricata of Leight.) on young oak, &c. 



Var. e. macularis (Leight.) occurs at Castlebernard. 



5. G. dendritica (Ach.). Hymenodecton dendriticum (Leight, Mon. Br. 

 Graph.). On trees, frequent ; especially fine at Castlebernard Park,, 

 where the var. obtusum (Leight.) also abounds. 



6. O. Lyellii (Ach.). Chiographa Lyelli (Leight., Br. Graph.). On 

 young oak3 ; Cahirlogue, and in a wood opposite Coolmore, Cork ; abun- 

 dant in Castlebernard Park, where the following forms also occur : — 



(1) Radiata (Carr). On oak. 



(2) Macularis (Carr). On aged beech : and — 



(3) Fastigiata (Carr). A beautiful form, resembling some states of 

 Graphis dendritica. On young trees ; also found by Admiral Jones. 



Opegrapha (Ach.). 



1. 0. varia (Pers.), (Leight., Mon. Br. Graph.). " Spores 5-septate." 

 On trees in various places, as at Ardrum, near Cork, Muckross woods, 

 Killarney, &c, but not nearly so common as the following species. 



2. O.rimalis (Ach.). 0. Turneri (Leight., Mon. Br. Graph.). "Spores 

 3-septate." Very common on trees, and varying extremely in form. I 

 do not believe this plant to be more than a state of the preceding. 



3. 0. saxatilis (D. C.) f (Leight., Mon. Br. Graph.). On a hill near 

 Fermoy ; T. Chandlee, whose specimens have the spores 7- septate, as in 

 Leighton's figure ; other specimens, collected by myself, on limestone, 

 near Cork, have been referred hither by Mr. W. Mudd, but they do not 

 exactly correspond in this respect. 



4. 0. Chevallieri (Leight., Mon. Br. Graph.). On various rocks ; 

 common. Nylander refers this to 0. air a (Pers.), but the spores are 

 different. 



5. 0. saxigena(Tayl), (" Flora Hibernica," Part ii., p. 259). Kerry, 

 D. Moore ; Derrynane, T. "Wright ; rocks at the Old Head of Kinsale. 



6. 0. atra (Pers.). On trees everywhere ; very common. A form 

 with very short, almost dot-like, lirell© occurs on ash at Carrigaloe, 

 near Cork, and is probably var. hapalea of NyL 



7. 0. vulgata (Ach.). On trees, very common, several forms occur. 



8. 0. herpetica (Ach.). 0. herpetica, a. vera (Leight., Mon. Br. Graph.) 

 Armagh, on ash and birch ! Admiral Jones. Rare. 



