OF GREAT BRITAIN. 



291 



Scotland : — Graig Tullooh. Rtv. J. M. Crombie. 



"Spores .011—15 mm. long, .0035— .0045 mm. broad." (Nyl.) "Spores 

 .009—12 mm. long, .0025—40 mm. broad. I intense-blue." (T. M. Fries: 

 Spores .013 mm. long, .004 mm. broad, 



137. L. rivulosa, Ach. mouse-coloured or pallido-fusco-cineras- 

 cent, rimuloso-areolato-diffract, areolae plane, nigricanti-limitate, 

 (K — ■ C — ) ; apothecia fuscous-black, moderate, sessile, margin thin, 

 paler, flexuose, dish plane, opake, minutely granuloso-papillate, inter- 

 nally entirely whitish ; hypothecium pale ; spores 8, colourless, 

 oblong, slightly curved, simple ;, paraphyses distinct, apices fuscous. 



On mountain rocks, common. 1807. 



Syn :— Aoh. Meth. 38. (1803.) Syn. 28. Nyl. Scand. 222. Mudd Man, 199. ' 



Fie :-E. Bot. 1737. Hepp Sporen t. 57. f. 491. 



Exs :— Zw. 7. 93. Hepp 491. Nyl. 59. Fries 404. 



Geog. Distrib : — Sweden, France, Germany, Italy, Switzerland. 



Bot. Prov :— 1...3, 5...7...10, 11.. .18, 19.. .26, 31. 



England ; — Kildale ! Ayton Moor ! Yorkshire. Mr. Mudd. Horsleyhope 

 Bourn, Durham. Wooler Water foot of Cheviot, Northumberland. Mr. Winch. 

 Sheepstor, Devon. Ightham, Sharpitor, Kent. Mr. Holmes. Mynydd-y-Myfyr ! 

 Oswestry, Shropshire. 



Scotland : — Garrynahine. Lewis. Dr. Lindsay. Braemar. Bev. J. M. Crombie. 



Ireland : +Near Glengariff ! Mr. Carroll. Delphi, Connemara. Mr. Lar- 

 ■ balestier. 



Wales :— Holyhead ! Barmouth ! 



Channel Islands : — Le Fret ! Jersey ; Jerbourg ! Guernsey. Mr. Larbalestier. 



"Spores .009—12 mm. long, .004 — 6 mm. broad. I blue then vinous-red, 

 especially apices of asci. Spermatia cylindrical, slender, straightish or curved, 

 .004 mm. long, .001 mm. broad." (T. M. Fries.) " Spores .009— .012 mm. long, 

 .0045— .0055 mm. broad." (Nyl.) " Spores .0025 in. long by .001 in. broad." 

 (Mudd.) Spores .012 mm. long, .0055 mm. broad. I deep-blue. Theexcipulum 

 is laterally and externally fuscous, and may be frequently traced under the 

 entire pale hypothecium. ' The internal contents of the spores have a tendency 

 to constriction and division in the middle. In the typical form the thallus is 

 thicker and more crustaceous, and verrucoso-areolate. 



forma depressa, Leight. minutely areolato-rimose, areolae de- 

 pressed'flat, plane, sometimes slightly concave ; apothecia sessile. 

 On mountain rocks, frequent. 



Exs :— Eabh. 775. Anzi Ital. S. 250. Langob. 162. 

 Geog. Distrib :— Germany, Italy. 

 Bot. Prov:— 7... 20. 

 Ireland : — West Cork ! Mr. Carroll. 



Wales : — Pass of Llanberis ! Holyhead ! Crib Coch ! Snowdon. Llyn 

 Cwlyd ! Tanybwlch Wood ! Capel Curig. 



forma obscurior, Crombie. thallus areolato-rimose, of a dark 

 dusky colour caused by the intersection and predominance of the 

 serpentine lilies of the brownish-black hypothallus ; apothecia 

 sessile. 



On mountain rocks, not common. 1865. 

 Bot. Prov :— 7. 

 Wales :— Glyder Vach ! Aran Mowddwy ! Llyn y Ddinas, near Beddgelert ! 



forma depauperata, Leight. thallus evanescent, leaving only the 

 dusky hypothallus ; apothecia sessile. 



On quartzose rocks and boulders, rare. 1871. 

 Bot. Prov: — 7. 



Wales : — Cwm Cywion ! Nant Francon (1871.) 



There is a corticolar form represented by Hepp 730. Rabh. 808. T. M. 

 Fries 43. Zw. 267. growing on Beech and Birch in Scandinavia and Germany, 

 but not yet detected in Great Britain, 



