272 DR. LINDSAY ON THE SPERMOGONES AND 
as in No. 4, sometimes straight, though more frequently somewhat curved, s050 X 15000 
on very short, simple sterigmata. 
Specimen 7. From the same locality as No. 6; collected by Prof. Dickie. Associated 
with Graphis anguina, Mont. Thallus occurs in olive-brown patches. There are no 
lirellæ, but two forms of spermogone, externally alike, but differing in the shape and size 
of the spermatia. In the one form the spermatia are sickle-shaped or crescentic when 
free and fully developed, narrowly subellipsoid or plano-convex when still attached. The 
sterigmata are simple, subeolumnar, about 3555 long with attached spermatia, the 
latter, when free, measuring 3055 X s5.5509. In the second form of spermogone the 
spermatia are cylindrical, of equal width throughout, as in Nos. 4 and 6, straight or 
slightly curved, 3555 to 50005 X rs000 
Specimen 8. Castlebernard Park, Bandon, March 1858: Carroll. Here again there 
are two forms of spermogone, characterized by different spermatia. In one group the 
plant is associated with Graphis dendritica, Ach. The spermogonal cavity is simple. 
The spermatia are very abundant, narrowly crescentic, 3055 X 55460: the sterigmata 
sublinear, with attached spermatia 355 long, and pale brown in colour, a most unusual 
feature in lichen-sterigmata, the colour here being, however, obviously derived from the 
basal cellular tissue, which is deep brown. The second form of spermogone is associated 
with lirellze so small that they resemble those of O. herpetica, Ach. These spermogones 
are very minute brown dots, abundantly scattered among the apothecia. The spermatia 
are, as in Nos. 4, 6, and 7, linear (or cylindrical), straight or (chiefly) curved, 3655 X 
50-500 With rounded ends. 
Specimen 9. On old bark, Killarney: Carroll. Thallus smooth and white; lirellæ de- 
generate, containing no sporidia.  Spermogones are large and distinct, round, black 
 papille, so abundant as to give a black-punctate character to the thallus, sometimes 
crowded, frequently confluent, and then acquiring considerable irregularity of shape. 
The spermatia are all crescentic, 3155 X 55-800 on simple sterigmata. 
Specimen 10. On old bark, near Queenstown, Cork harbour, Mar. 1858: Carroll. 
Associated with Stigmatidiwm crassum, Dub., and its spermogones. The spermatia of 
the Opegrapha are crescent-shaped (or lunated), 55455 X sosoo on short, simple ste- 
rigmata. 
Specimen 11. On old bark, Rostellan, Cork harbour: Carroll. Associated with Leca- 
nora aurantiaca. Thallus is white, in roundish patches. The spermatia are here again 
all ereseentie, 3455 X 35500, on simple sterigmata. 
Specimen 12. On various trees, Dunscombes Wood, Cork: Carroll Associated with 
Verrucaria Taylori, Carr. The spermogones vary much in size, many of them being 
very large, distinct, and NONAS ae as in other cases, black and scattered. Spermatia 
are crescentic, 5; 
3200 on subcolumnar, simple sterigmata. 
Specimen 13. On birch, Glenarm Deer-park, co. Antrim: Dr. Moore, in herb. "Carroll. 
Associated with Lecanora varia. Spermogones abundant. Spermatia as in Nos. 4, 6, 
and 7, cylindrical, straight or slightly curved, 4455 X 55460 in the fully formed state. 
But there are many much smaller, and mostly straight, which are either abortive or 
