OF GREAT BRITAIN. 69 



II. PILOPHORON. Tuck. 



Thallus subsquamaceo-granulose. Podetium rigid, cylindrical, 

 simple, or branched upwards, granulate. Apothecia nigro-rufous, 

 capituliform, subglobose, internally solid. Spores 8, colourless, 

 ellipsoid, or oblongo-ellipsoid, simple. Sterigmata simple. Sper- 

 matia cylindrical, curved or straight. 



1. P. fibula, Tuck, whitish, subsquamaceo-granulate, concres- 

 centi-areolate, appressed ; podetia solid, erect, terete, very short, 

 simple, subsquamaceo-granulate ; apothecia subglobose, depressed; 

 spores 8, colourless, ellipsoid, or ellipsoideo-fusiform ; cephalodia 

 thalline, fusco-nigricant, minutely tuberculose. 



On perpendicular wet rocks, rare. 



Stn —P. fibula, Tuck. Syn. Lioh. N. Amer. p. 46. (1845). Nyl. Syn. 229. 



Fig :— Th. M. Fries Mon. Ster. & Pil. t. 10. f. 5. Nyl. Syn. t. 7. f. 6. 



Geog. Distbib :— N. America, Lapland, Norway, Sweden, Finland. 

 ■ Bot. Pkov:— 5...7...16...26. 



Scotland : — Morrone, Ben Cruaehan. Rev. J. M. Crombie. near Cuchullin 

 Hills, near Sligachan, Isle of Skye ! Mr. Piggot. 



Ireland : — Kylemore Castle ! Salrook Road ! co. Galway ! Mr. Larbalestier. 



Wales : — Llyn Cae ! Llyn Aran ! and the Giant's Pebbles ! Cader Idris ! 

 Arran Mowddy ! Pass of Llanberis ! Snowdon ! Cwm Oywion ! Cwm Ffynnon 

 Lloer ! Cwm Clwyd ! Capel Curig ! 



"Spores .017—20 mm. long, .006—8 mm. broad." (Nyl.) 



A single specimen of another species, named by Dr. Nylander in a 

 letter to Rev. J. M. Crombie, 1875, and noted by the latter in Journ. Bot. 

 May, 1875, as P. strumalicum, Nyl. was collected by Mr. Crombie on mi- 

 caceo -schistose rocks at Morrone, Braemar, in 1869. But no diagnosis of 

 this excessively rare species nova has as yet been published, therefore I 

 am ignorant of its peculiar characteristics, particularly as I have seen 

 no specimen. 



Tribe V. STEREOCAULEI. 



Thallus generally casspitose, formed of podetia with a solid car- 

 tilaginous medullary axis, around which the white exterior fragile 

 granulose portions of the thallus are congregated. Apothecia ter- 

 minal or lateral, lecideine, nigricant or fuscous. 



I. STEREOCAULON. Schreb. 



Podetia covered with fragile granules of various forms. Apo- 

 thecia fuscous or fusco-pallescent, internally solid. Spores cylin- 

 draceo-fusiform, with few or many septa, (3 — 9). Sterig- 

 mata simple. Spermatia aciculari-bacillar, straight, or slightly 

 curved. 



1. S. coralloides, Fr. csespitose, ramose, glabrous, granules cin- 

 erascent, subfibrillose or digitato-divided ; apothecia terminal and 

 lateral ; spores cylindraceo-fusiform, 3-septate ; cephalodia ciner- 

 ascent, verrucose, minutely granulate, sessile. 



On rocks, common. 



Syn :— S. coralloides, Fr. Sched. Crit. 4. p. 24. (1824). Nyl. Scand. 63. Syn. 

 241. Mudd Man. 65. 



Fig:— Nyl. Syn. t. 7. f. 16. Scheer. En. t. 6. f. 5. 



