OF FILAMENTOUS, FRUTICULOSE, AND FOLIACEOUS LICHENS. = 24 
Specimen 12.—Var. tenella ; on walls, Penmanshiel, Berwickshire, 1856; coll. 
James Harpy; no apothecia. The spermogones are sometimes isolated, some- 
times grouped. The latter chiefly occur about the centre of the thallus. Some 
_ of them are very large, prominent, black warts, flattened above, and with a dis- 
tinct ostiole. 
Specimen 13.—Var. tenella; Morchone, Braemar; on trees, August 1856, 
W.L.L. This is a dark olive-green form, closely resembling P. obscura. The 
margins of the lacinice bear few cilia. On the same trees occurs the broad-lobed 
form of P. stellaris. The spermogones are few and scattered. 
Specimen 14.—Var tenella; on the trunks of trees, under Dunscombe’s Wood, 
Cork; coll. CarRoLL; associated with P. obscura. The spermogones are distinct, 
as black or brown papillee. The spermatia are about zath long, and s,nth broad ; 
the sterigmata measure jth to ;ath in length. The var. tenella is common in 
Ireland, according to TayLor in Herb. Mackay. Spermogones are plentiful in 
specimens from Carrigaloe, Cork; coll. Carroxi; on the bark of trees. 
Specimen 15.—Var. tenella ; Bieldside, Aberdeen, Professor Dickiz; one of the 
very common transition forms between the aipolia and the tenella varieties, the 
marginal fibres or cilia being neither many nor prominent. The spermogones are 
plentiful and prominent as brownish papillee or tubercles, varying much in size. 
The envelope is, as in all cases in P. séellaris, brown; the spermatia goth long, 
and simth broad ; and the sterigmata about jth to goth long. 
Specimen 16.—Var tenella, Scu#RER exs. 349 (sub Parmelia pulchella ry. semipin- 
nata); on palings about Belp, Switzerland. The spermogones are prominent black 
cones or tubercles sparingly scattered. Exs. 351 (sub 6. ambigua); on young ash 
trees about Belp.; on the right-hand specimen in my copy (ed. alt. immut. 1840). 
The spermogones are here smaller, but are still distinct. The spermatia are th 
long, and the sterigmata auth to guth. Exs. 352 (sub 6. tenella), on the trunks of 
trees about Belp. The spermatia are very minute, about jth long, and gtnth 
broad, sub-ellipsoid, andin myriads. The sterigmata are longish, the articulations 
being numerous and short. Hepp. exs. 15, associated with Lecidea chalybeia ; on 
old willows and poplars. The spermatia and sterigmata are those of the type. 
Specimen 17.—Var. adglutinata mihi; on trees, roadside, Caerlaverock Road, 
Dumfries, August 1856, W. L. L. This is a peculiar form from the thallus being 
rather crustaceous than of the usual foliaceous type. It is very closely adherent 
to the bark on which the plant grows; unless at the periphery here and there, 
there is little or no trace of lacinia, the thallus consisting of a series of white 
crustaceous warts. The whole plant has a close resemblance to some forms of 
Lecanora sophodes or L. atra. The spermogones also resemble externally those 
of the Lecanoras just named. They are minute black points, scattered on the 
warts aforesaid, and among the apothecia. The spermatia are about sath long ; 
the sterigmata very irregular, sub-ramose, thickish, composed of short broadish 
VO. XXII. PART I. 3R 
