.PYCNIDES OF CRUSTACEOUS LICHENS. 303 
Species 10. C. FURFURACEUM, L. (— Coniocybe, Mudd, Br. Lich. p. 262). 
Specimen 1. On firs, woods about Berne, Switzerland: Scher. Exs. No. 14. Nothing 
but spermogones occur in the upper specimen in my copy (ed. alt. immut. 1842). They 
are small round tubercles, green-pulverulent externally, black within, resembling asti- 
pitate apothecia, seated on the thin, green-pulverulent thallus. Envelope of deep- 
brown cellular tissue. Spermatia ellipsoid or oblong, distinct, on short, very slender, 
simple, linear sterigmata. 
Specimen 2. Var. sulphurellum, Fr. (Mudd, Br. Lich. p. 262). On the bark of old 
Populus nigra, Switzerland: Hepp Exs. No. 154. Spermogones are abundant, scattered 
like grains of finest dust over the white-pulverulent or cream-coloured thallus, very 
minute, brownish, punctiform. Envelope of deep-brown-coloured cellular tissue. Sper- 
matia spherical or oval, atomic in size. Sterigmata very short, apparently linear, simple. 
Species.11. C. PALLIDUM, Pers. 
Specimen 1. Switzerland: Hepp Exs. No. 155, sub var. leucocephala, Wallr. Spermo- 
gones occur on a patch of thallus, associated with the lirellee of an Opegrapha, as small, 
black, superficial points or papillæ. Spermatia are linear, atomic in size, and borne on 
the apices of longish, linear, very delicate sterigmata that branch from the base. The 
spermogones in question may be referable to the Opegrapha rather than to the 
Coniocybe. 
EXPLANATION OF PLATES. 
PLATE VIII. 
Illustrative of the genus Lecanora, Ach. 
Fig. 1. Lecanora parella, Ach., Yorkshire ; Isidioid Fig. 8. L. tartarea, Kerry : spermatia. 
condition (Isidium corallinum, Ach.): Fig. 9. L. glaucoma, Ach., Cliffrigg: sterigmata 
a, section of thallus, showing spermo- and spermatia. 
nes; 5, sterigmata; c, spermatia. Fig. 10. Ditto, Leighton’s Exs. No. 247: a, por- 
Fig. 2. Ditto, Glen Callater: sterigmata and sper- tion of thallus, showing apothecia (two 
matia. of them the site of the parasitic 
Fig. 3. Ditto (=Jsidium dactylinum, Ach.), Kew Arthonia varians, Dav.) and spermo- 
herbarium: sterigmata and spermatia. gones; b, c, sterigmata and spermatia. 
Fig. 4. L. tartarea, Ach., Ben Mac Dhui: sterig- Fig. 11. Ditto, Belfast: sterigmata and sper- 
mata and spermatia. matia. 
Fig. 5. Ditto, Scherer’s Exs. No. 541: sterigmata Fig. 12. L. cinerea, Ach., var. calcarea, L.; Kil- 
and spermatia. | cully: a, portion of thallus, showing 
Fig. 6. Ditto, Swiss Alps, in Kew herb. : ditto. apothecia and spermogones ; £, section 
Fig.7. Ditto, var. gonatodes, Ach., Kew herb.: of thallus, showing ditto; c, d, sterig- 
ditto. mata and spermatia. 
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