310 DR. LINDSAY ON THE SPERMOGONES AND 
Fig. 39. Opegrapha varia, Pers., var. notha, Ach., 
Killarney: a, thallus, showing apo- 
thecia and spermogones; 5, section of 
thallus, showing ditto; c, sterigmata 
and spermatia. 
Fig. 40. Ditto, var. rimalis, Fr., Muckross: a, 
thallus, showing apothecia and sper- 
mogones ; 4, spermatia. 
Fig. 41. Ditto, var. pulicaris, Lightf., Hepp’s Exs. 
No. 166: a, basidia and stylospores 
of pycnides; b, sterigmata and sper- 
matia of spermogones. 
Fig. 42. Ditto, var. pulicaris, Scherer’s Exs. 
No. 518: sterigmata and spermatia. 
Fig. 43. Ditto (type), Ireland : ditto. 
Fig. 44. Ditto, Schærer’s Exs. No. 437 : ditto. 
Fig. 45. Ditto, Hepp's Exs. No. 155: ditto. 
Fig. 46. Ditto, Dunscombes Wood : ditto. 
Fig. 47. O. Chevallieri, Leight., Leighton's Exs. 
No. 67 : ditto. 
Fig. 48. O. rupestris, Pers., Enniskillen: a, thal- 
lus, showing apothecia and spermo- 
gones; à, portion of thallus, magnified, 
showing ditto; c, section of thallus, 
showing ditto; d, spermatia. 
Fig. 49. Opegrapha rupestris, co. Antrim : sterig- 
mata and spermatia. 
Fig. 50. Ditto, var. saxigena, Tayl., Kerry : ditto. 
Fig. 51. Graphis scripta, L., Rostellan: a, thal- 
lus, showing apothecia and pycnides; 
b, portion of thallus magnified, show- 
ing ditto; c, section of thallus, show- 
ing ditto; d, basidia and stylo- 
spores. 
Fig. 52. Graphis scripta, var. horizontalis, Leight., 
Leighton's Exs. No. 244: a, sterig- 
mata and spermatia. 
Fig. 53. Ditto, var. spathea, Ach., Schzrer's Exs. 
No. 88: a, sterigmata and spermatia ; 
b, sterile articulated spermogonal fila- 
ments. 
Fig. 54. Graphis anguina, Mont., Belfast : a, thal- 
lus, showing apothecia and spermo- 
gones; 6, section of thallus, showing 
ditto; c, sterigmata and spermatia. 
Fig. 55. Melaspilea deformis, Sch., Scherer’s Exs. 
No. 283 : sterigmata and spermatia. 
Fig. 56. Platygrapha  periclea, Ach., Scherer, 
Exs. No. 313 : ditto. 
PLATE XIV. 
Illustrative of the genera Arthonia, Ach., Stigmatidium, Mey., Mycoporum, Flot., 
Endocarpon, Hedw., and Verrucaria, Pers. 
Fig. 1. Arthonia astroidea, Ach., Carrigaloe: 
a, thallus, showing apothecia, spermo- 
gones, and pycnides; à, section of 
thallus, showing ditto; c, spermatia 
of spermogones; d, basidia and sty- 
lospores of pyenides. ; 
Fig. 2. Ditto, Great Island: basidia and stylo- 
spores. d 
Fig. 3. Ditto, var. Swartziana, Ach., Yester 
House: a, thallus, showing apothecia 
and pyenides; à, section of thallus, 
showing ditto; e, basidia and stylo- 
spores. 
Fig. 4. Ditto, ditto, Malham: sterigmata and 
spermatia. 
Fig. 5. A. einereo-pruinosa, Sch., Schærer’s Exs. 
No. 251: ditto. 
Fig. 6. Arthonia impolita, Ehrh., Leighton's Exs. 
No. 131 : sterigmata and spermatia. 
Fig. 7. Ditto, Schærer’s Exs. No. 286 (— Pyreno- 
thea insculpta, Wallr.): ditto. 
Fig. 8. Ditto, Hepp's Exs. No. 229 (= Thrombium 
byssaceum, Weig.) : ditto. 
Fig. 9. Ditto (— Verrucaria or Pyrenothea bys- 
sacea, Ach.), Kew herb.: spermatia. 
Fig. 10. A. punctiformis, Ach., var. olivacea, Ach., 
Leighton's Exs. No. 223: sterigmata 
and spermatia. 
Fig. 11. 4. lurida, Ach., Hepp's Exs. No. 161: 
spermatia. 
Fig. 12. Ditto, var. spadicea, Leight., Leighton's 
Exs. No. 97 : section of a spermogone, 
showing sterigmata and spernratia. 
Fig. 13. Ditto, Schærer’s Exs. No. 17 : spermatia. 
