232 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
first developed, and subsequently the apothecia. But this would not appear to 
be the case here at least. The cavity of the spermogone is simple; its internal 
tissue gray. The spermatia are acicular, varying in size usually from zath to ~cth, 
with a breadth of goth. The sterigmata consist of three to six delicate, cylin- 
drical articulations or cells, and measure in length about zath to th. Both 
spermatia and sterigmata resemble those already described as occurring in P. saxa- 
tilis and P. physodes. 
Specimen 1.—On old walls about Moffat, Dumfriesshire, August 1851; 
W.L.L. The apothecia are more abundant and beautiful in Moffat specimens 
than in any others I ever collected. The spermogones are plentiful on the con- 
vexities, and towards the ends, of the lacinize. The spermatia are about th to 
6000 
zn th long. The sterigmata are ramose, and composed of a few long, delicate, 
7000 
cylindrical articulations. 
Specimen 2.—Var. minor; Glen Clova, Forfarshire ; coll. Croat, July 1853; 
on stones. Here, also, the spermogones are most plentiful about the ends of the 
lacinize, as very minute brown or black flat points. Apothecia are less abundant 
and large than in No. 1. 
Specimen 3.—LrEIeut. exs. 79, var. stenophylla, Scherer; on stones, Bardon 
Hill, Leicestershire; a form with narrow, linear, convex laciniz. On the right- 
hand specimen in my copy the spermogones are very large and abundant on the 
convexities of the thalline lacinize, as prominent, black cones—frequently fiat- 
tened. The spermatia and sterigmata are as above described. 
Specimen 4.—Glenesk, Forfarshire; on old walls, at the foot of the glen; small- 
lobed form. Quebec, SHEPHERD; both in Herb. Hooker, Kew. The latter has 
large distinct spermogones. A specimen in the Herbarium of the Botanical 
Society of Edinburgh, with apothecia—no habitat given—has a thallus black-punc- 
tate over its whole surface from the profusion of spermogones. Back River 
Gully, Tasmania, on rotten wood; coll. by OLDFIELD; in Herb. Hooker; is a large- 
lobed form, resembling P. caperata, with a few large, scattered spermogones. 
Specimen 5.—ScHZRER exs. 379 (sub P. centrifuga a. conspersa); on micaceous 
stones, Switzerland. Spermogones abound, in every stage of their development; 
sometimes punctiform, sometimes maculiform, always thickly aggregated, fre- 
quently with black, stellate-fissured ostioles. The spermatia are acicular, and 
about th long. The sterigmata, with the spermatia attached, measure about 
4000 
anth to 4th long. | 
Specimen 6.—HeEpp. exs. 37; on the same piece of stone with Lecidea atro-alba 
6, vera. Neg. There are only a few fragments of P. conspersa, which are studded 
over with the apothecia of Lecidea oxyspora, Tul. These are round, discoid, 
largish, black, and immersed; the thecee are 8-spored, easily found, and strike 
a blue colour with solutions of iodine. These apothecia cannot be confounded 
with the spermogones of P. conspersa ; but the spermogones of L. oxyspora 
