Y 
222 DR. LINDSAY ON THE SPERMOGONES AND 
small, pellucid, round, and flat, each crowning one of the thalline areolæ. Spermatia 
are very minute straight rods, about 15555 long and 355605 broad, given off by arthro- 
sterigmata about 3755 long, composed of short, thick, irregular articulations. Nylander, 
however (Prod. p. 85), describes the sterigmata as simple. 
Species 9. L. SULPHUREA, Ach. 
This so-called species is, frequently at least, undistinguishable from var. intricata, 
Schrad., of L. varia, and is, I think, as properly referable to the protean and compre- 
hensive L. varia as intricata is. The spermogones and spermatia in sulphurea are the 
same as those of varia. 
Specimen 1. On roadside walls between Perey and Spittal of Glenshee; on gneiss 
stones: Aug. 1856, W. L. L. The spermogones are abundant as small, black, sub- 
prominent points or papillule seattered among the apothecia, sometimes in groups or 
patches made up of considerable numbers. Spermatia are also very abundant, of the cha- 
racter of those of L. subfusca, about 5555 to 1550 long, thickish, with rather obtuse ends, 
curved or twisted, at least in the free state, though comparatively straight while attached. 
Sterigmata are longish, simple, branching digitately from base, the divisions being linear; 
sometimes they are so compactly arranged as to appear fused, especially below, into a 
common structureless or homogeneous mass. . 
Specimen 2. On compact felspar and felspar porphyry, Craig Rossie, Dunning, 
Strathearn, April 1858: W. L. L. The spermogones are minute, round, bluish-black 
papilla, or, when wholly immersed, punctiform, conspicuous on the pale greenish 
thallus, scattered abundantly about the black hypothalline boundary-line, sometimes 
confluent, and then resembling degenerate apothecia; also frequently grouped on more 
central thalline areolæ, and then resembling the perithecia of Stigmatidium crassum. 
The spermatia and sterigmata are of the character of the type, the former twisted (or 
subvermiform), about 3355 tO 5566 long and 35:555 broad; the latter simple, measuring, 
with attached spermatia, only 1955 to 1355. 
Specimen 3. On basalt, Deer Park, Glenarm, co. Antrim: Dr. Moore, in herb. Carroll. 
Spermogones are abundant, as deep bluish-black points, aggregated in groups outside 
the region of the apothecia, or generally studded over areolæ destitute of apothecia ; body 
immersed ; ostiole irregular, roundish or elongated, distinct under thelens. Here, again, 
the punetiform spermogones have externally the aspect of the perithecia of Stigmatidium 
crassum, than which, however, they are generally larger and less regularly round. "The 
spermatia are, as in varia, 3755 long and 35555 broad, mostly curved or twisted when 
free, but straight (more or less) while attached, as is common in the case of subvermi- 
form spermatia. Sterigmata, as in the preceding cases, short and simple. 
Specimen 4. On sandstone, Glengariff, Carroll: associated with Lecidea parasema, 
var. coniops, Ach. Spermogones are minute, round, blackish-blue points, scattered 
abundantly about the periphery of thallus, outside the region, therefore, of the apothecia. 
Spermatia are very tortuous or serpentine (vermiform), about +55 to vooo long and 
39,099 broad, seated on simple subdigitate sterigmata, which, with attached spermatia, 
measure 3755 long. 
