276 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
longish arthrosterigmata. Similar spermogones occur, giving a denticulate 
character to the margins of the curled lobes, in specimens from Glencairn Deer 
Park, coll. D. Moorr, in Herb. Carroll. In specimens from near Galway, on 
limestone rocks, coll. D. Moorr, in Herb. Carroll, and Black Rock, Cork, on 
limestone, coll. CARROLL, the spermogones are more or less closely aggregated. 
SpEcIES 9. C. microphyllum, Ach. 
Specimen 1.—Scu®RER exs. 411 (sub Parmelia mgrescens e. microphylla, Sch.) ; 
on the trunks of trees, Switzerland; withapothecia. The spermogones are small 
light-brown or yellowish tubercles, scattered near the edges of the lobes, on their 
flat surface. They somewhat resemble those of Leptogiwm tremelloides. The 
spermatia are rod-shaped, anth to ath long. 
Species 10. C. nigrescens, Ach., 
A widely-spread species, which occurs in Europe, Asia, America, Polynesia, and 
New Zealand. 
Specimen 1.—Hepp. exs. 216 (sub Synechoblastus vespertilio, Lightf. Syn. Col- 
lema nigrescens a. vespertilio, Scheer. exs. 410; Moug. and Nestler, 164, p.p. and 
453; Leight. exs. 104); on the bark of old fruit-trees. In the right-hand speci- 
men in my copy, spermogones occur. They are wholly immersed, and are exter- 
nally of the same colour as the thallus, except the ostiole, which is of a pale-brown 
colour and round. The ostioles pierce the apices of the thalline papillee, which 
are seated external to the region occupied by the apothecia. The spermatia are 
rod-shaped, about goth to mth long, seated on ramose, irregular arthrosterigmata. 
Species 11. C. multipartitum, Sm. 
This European species seems closely allied to NyLANDER’s C. laciniatum, from 
Alabama. 
Specimen 1.—Dunkerron; coll. TayLor; in Herb. Hooker, Kew. The specimen 
is bad, and in small detached fragments; the apothecia are young. Thespermo- 
gones are abundant, scattered over the margins of the lacinize; seated on large, 
pale warts; sometimes confiuent, and always more or less irregular. 
Species 12. Oollema? epiphyllum, Leight. 
Specimen 1.—LeicutTon exs. 103; on laurel and other leaves, Gopsall, Leices- 
tershire. There are here two distinct plants. The one occurs in small round 
scales, gelatinous when moistened, becoming, in progress of growth, palmate and 
divided irregularly. This plant has quite the aspect of Collema externally, 
but has not its structure internally. Neither has it distmmct apothecia, thecz, 
spores, nor spermatia. The other plant is a granular, blackish mass, occurring 
in round patches of varying size. It possesses Pycnides, but neither apothecia 

