PYCNIDES OF CRUSTACEOUS LICHENS. 257 
Under the name of Buellia corrugata, Körber (Syst. Lich. Germ. p. 229) describes a 
Lecidea (Buellia), which grows on palings and posts in the town of Siegnitz, Germany, 
whose apothecia closely resemble the typical or usual (Lecideine) spermogones of Z. Ehr- 
. hartiana. But the apothecia of the Buellia are at once distinguished, on microscopical 
examination, by their brown, l-septate sporidia. Nor can these sporidia be confounded 
with the sporidia of L. Ehrhartiana, which are simple and colourless. 
Of the spermogones of Z. Ehrhartiana, authors, especially those of the præ-microscope 
era, have made not only varieties and species, but even genera, as the following syno- 
nymy illustrates ; while some have referred them to the Fungi or to other genera, species, 
or varieties of Lichens :— 
Rhytisma, Fr. 
Limboria, Ach. 
Cliostomum corrugatum, Fr. L. E. R. p. 455, Exs, No. 254: Leight. Ang. p. 69, pl. 30. f. 1. 
Thrombium corrugatum, Sch. Enum. p. 225, Exs. No. 192: Hepp, Exs. No. 228. 
Pyrenothea corrugata, Mass., Rich. pp. 127 & 151. 
Lecidea corrugata, Ach., Sch. Exs. No. 192, Enum. p. 224. 
Lecanora varia, Ach., var. graniformis, Sch. Enum. p. 82. 
Lichen graniformis, Hagen, Dickson, & Engl. Bot. pl. 1464. 
Calicium roscidum, Flk., var. graniforme, Dicks. & Engl. Bot. 
C. hyperellum, Ach,, var. roscidum, Ach. 
C. claviculare, Ach., var. roscidum, Ach. 
Peziza hysterium, Persoon. 
A parasitic fungus, Leight. 
The peculiar spermogones separate Hhrhartiana from Lecanora varia, whose sper- 
mogones and spermatia are very different. But it is doubtful whether two lichens, with 
apothecia frequently so much alike externally, should be separated in different genera. 
Species 25. L. ABIETINA, Ach. 
Specimen 1. On old bark, Cromaglown, Killarney: Dr. Taylor in the herbaria of 
Drs. Moore and Mackay of Dublin. Dr. Moore's plant is unassociated with apothecia, 
consisting of pycnides only, as brown subglobose warts or cones, covered with a white 
pruina; sometimes, however, with the pruina rubbed off, and then appearing blackish. 
They are developed under the cortical layer of the bark, bursting through it, and at first 
surrounded by a ruptured ring thereof. Frequently they afterwards become substipi- 
tate, like some species of Calicium. The stylospores are very abundant, narrowly 
ellipsoid, colourless, 35355 X 100600 Dr. Mackay’s plant occurs on old birch trees, and 
also consists of pyenides only, the stylospores being exactly of the same size as in Dr. 
Moore's specimens; the basidia very short and simple. 
Specimen 2. On birch, Bushiel Dean, Hardy; in the herb. of the Royal Botanic 
Garden, Edinburgh. Apothecia and pycnides are here associated. 
Specimen 3. Yorkshire: Dr. Carrington, 1857. There are here no apothecia. The 
pycnides are small, black, irregular in form, rough on the surface, containing stylospores 
of the same form and size as in No. 1. 
