302 DR. LINDSAY ON THE SPERMOGONES AND 
degenerate and indeterminable Lecideoid apothecia are associated. Two forms of spermo- 
gone occur, externally alike, and both abundant, scattered among the apothecia of the 
Calicium as small, black, prominent papillæ, irregular in outline. The cavity is simple; 
the envelope of deep-brown cellular tissue. In one form the spermatia are rod-shaped, 
yoyo X so. sgg. In the other they are atomic, on short, simple, but indistinct sterigmata. 
Species 6. C. TYMPANELLUM, Fr. (=Acolium, Mudd, Br. Lich. p. 254). 
Specimen 1. On the bark and decorticated trunks of pines, Switzerland: Scheer. Exs. 
No. 438, sub C. inquinans. Spermogones are small, black dots, on separate thalline 
warts. Spermatia rod-shaped, 5555 — ro:000 X 55-600 on Sterigmata 45555 long, simple, 
but bulging irregularly in outline, especially inferiorly, so as to assume the appearance 
of Florence flasks. I have already pointed out that Korber (p.302) describes the sper- 
matia of the subgenus Acoliwm as long and curved. Nylander, on the other hand, refers 
this lichen to the subgenus Trachylia, of which, he says, the spermatia are oblong or 
ellipsoid—that is, straight (Syn. p. 164) ! 
Species 7. C. STIGONELLUM, Fr. (—.4colium, Mudd, Br. Lich. p. 255). 
Specimen 1. On rugged old bark, Easby Wood, Cleveland, Yorkshire: Leight. Exs. 
No. 226. Spermogones are small black dots, scattered among the apothecia on the 
smoothish, white thallus. Envelope of brown cellular tissue. Spermatia oblong, very 
minute, on short, simple, linear sterigmata. Intermixed with the fertile sterigmata are 
numerous, very ramose, anastomosing, delicate, sterile filaments, as in Ramalina and 
other genera of the higher lichens. 
Species 8. C. TIGILLARE, Fr. (=4colium, Mudd, Br. Lich. p. 254). 
Specimen 1. On old lareh trees and on palings, St. Moritz, Switzerland : Hepp Exs. 
No.159. Two forms of spermogone occur. The one consists of very small, black or 
brown, punctiform conceptacles, scattered on the decayed timber between the yellow scales 
of the thallus. Its spermatia are rod-shaped, very small, very plentiful, on very short, 
apparently simple, but indistinct sterigmata. The other form is similar externally; but 
its spermatia and sterigmata have quite the characters of those of Opegrapha vulgata, 
none of whose lirellæ, however, are here associated. These spermatia are crescent-shaped, 
broad in the centre, acute at the ends, and at the same time curved. The sterigmata 
are simple, longish, subcolumnar; with their spermatia attached, they have quite a 
sickle-like character. The spermatia in question may be those typical of Acolium, as 
described by Kórber and formerly alluded to. 
Species 9. C. EusPORUM, Nyl. (— Stenocybe, Mudd, Br. Lich. p. 256). 
Specimen 1. On old bark, Ireland: Carroll. No habitat given. Sent me as an un- 
known Lecidea. Parasitic on the thallus of Thelotrema lepadinum, Ach. Pycnides occur, 
which, though associated with both, do not necessarily belong either to the Calicium or 
Thelotrema. They are black and punctiform, containing ellipsoid, pale yellow stylo- 
spores, 3005 X 3000 | 
