PYCNIDES OF CRUSTACEOUS LICHENS. 277 
tered in groups about or between the lirelle. The stylospores are here irregularly pyri- 
form or oval, seated on short, linear basidia, branching below in a palmate fashion, as in 
Lichina. 
Specimen 9. Var. pulicaris, Lightf. On old ash trees, near Kelvsatz, Switzerland : 
Scheer. Exs. No. 518, sub O. cymbiformis, var. phæa, f. brunnea. Spermogones are small, 
brown, punctiform, scattered among the lirellæ. Spermatia linear, rogoo long. Sterig- 
mata linear, branching slightly below, 4455 — 5060 long. 
Specimen 10. Var. rimalis, Fr. On bark, Muckross Woods, Killarney, Mar. 1858: 
Carroll Spermogones abundant, in appearance and size resembling the perithecia of 
Verrucaria epidermidis, scattered among the lirellæ, and occurring also on separate 
patehes of thallus by themselves as largish, subprominent, round cones. They frequently 
fall out of their site in the thallus, so superficial are they, leaving black saucer-like cavi- 
ties. The spermatia are very abundant, suboblong, 5555 X sosoo, on short, simple 
sterigmata. 
Species 5. O. CHEVALLIERI, Leight. 
Specimen 1. On rocks, Great Orme's Head, Caernarvonshire: Leight. Exs. No. 67. 
Spermogones are dotted over the white, smoothish, but tartareous thallus, outside the 
region of the lirellæ, but also interspersed among them as black papillæ or points, con- 
taining abundance of rod-shaped spermatia on sublinear sterigmata bifurcating below. 
Species 6. O. RUPESTRIS, Pers. 
Specimen 1. On flints, old church on Devenish Island, Enniskillen : Dr. Moore in herb. 
Carroll. Thallus thick, tartareous, white, subpulverulent. Spermogones abundant, very 
distinet from contrast of their blackness with the whiteness of the thallus, round, puncti- 
form or flattened cones, immersed wholly or partially. Spermatia are rod-shaped, 4455 X 
30500. On simple sterigmata about 3755 long. 
Specimen 2. On granite, co. Antrim: Dr. Moore in herb. Carroll. Associated with 
Chiodecton myrticolum, Fée, var. albidum, Tayl. Only one or two lirelle of the Ope- 
grapha occur on the fragment of rock; but its spermogones are abundant. They are 
small, but prominent, black cones, outwardly resembling the perithecia of Verrucaria 
chlorotica, Ach., perched on liis sae ela thalline scales of an olive tinge. The 
omm are rod-shaped, 15-555 X 55500; on linear sterigmata, branching sligh tly below, 
ho X 50-500 —that is, of equal width to the terminal spermatia. 
Specimen 3. Var. saxigena, Tayl. On sandstone, co. Kerry : in herb. Dr. Moore, named 
by Taylor himself. Spermogones are abundant, scattered mostly on portions of thallus 
bearing few lirelle. They are small, round, prominent, black cones, usually flattened on 
the tops. Spermatia rod-shaped, sogo X 5000; on simple, subfusiform sterigmata, about 
3050 long with spermatia attached. 
Species 7. O. SAxATILIS, DC. 
Specimen 1. Leighton, Exs. No. 242. Spermogones occur on a patch by themselves 
in the centre of the stone, externally resembling (save in their inferior size) the perithecia 
VOL. XXVIII. 2Q 
