ACROCORDIA| PYRENULACEX 485 
the septum, rather large, 20-33 » long, 6-10 » thick. Specimen 
not seen. 
Considered by Wheldon to be allied to A. Salweii, but distinct in 
the small perithecia and the large spores; these may have one cell 
rather larger than the other. 
Hab. On mortar mixed with many fine quartz particles, on a wall 
in Glen Maye, I. of Man, June, 1914. Collected by J. W. Hartley and 
J. A. Wheldon. 
ARTHOPYRENIA Massal. (Part 2, p. 315.) 
Page 323. For Arthopyrenia arenicola A. L. Sm., read— 
A. argilospila A. L. Sm., and add to synonymy :—Verrucaria 
argilospila Nyl. in Flora lvii. p. 15 (1874). Magmopsis argilospila 
Nyl. ex Cromb. in Grevillea xv. p. 10 (1886) & Monogr. i. p. 30. 
An examination of the specimens placed in Magmopsis and from 
the same locality as ‘A. arenicola”’ leaves no doubt as to their 
identity. There is on the thallus the overgrowth of the blue-green 
alg, in the fruits the entire perithecial wall with the minute pore at 
the apex, and the arthopyrenial characters of paraphyses, asci and 
spores. In more developed fruits I have found spores measuring up 
to 26 » in length, and on one spore a third septum was formed near 
the base. Otherwise they are as described. 
Magmopsis was placed by Nylander under the Tribe Pyrenidei 
(Flora lviii. p. 103 (1875) ). 
ADDITIONAL SPECIES RECEIVED AFTER THE 
APPENDIX HAD BEEN PRINTED 
(Part 2, p. 7.) 
5a. Gyalecta derivata A. L. Sm.—Thallus effuse, thin, finely 
furfuraceous, greyish or greenish. Apothecia small, urceolate, 
the disc pale-reddish, the margin whitish, thick, entire or broken 
here and there; hypothecium colourless; spores 8 in the ascus, 
7-12-septate and sparingly muriform, 27-30 yp long, 5-6 p thick. 
—Lecidea derivata Nyl. in Flora xlviii. p. 603 (1865). 
Nearly related to G. trwncigena, but differing in character of the 
spores. 
Hab. On tree trunks.—B. M. Navan, Meath. Collected by 
M. C. Knowles, August, 1915. 
(Part 2, p. 297, after Verrucaria.) 
Sarcopyrenia Nyl. in Maine & Loire Mém. Soc. Acad. iv. 
p. 69 (1858).—Thallus crustaceous. Algal cells Protococus. 
