Lecidea.] LICHEN ES. 179 



27. L. uliginosci) Ach. (earthy Marsh Lecidea); crust olive- 

 brown granulated subgelatinous, apothecia black flattish with a 

 black smooth border at length convex and clustered. Ach. Syn. 

 p. 25. — Lichen ulig., Schracl. — E. Bot. t. 14G6. 



Sandy heaths, near Yarmouth, Mr. D. Turner. Surrey, Mr. Borrcr. 



28. L. sytiothea, Ach. (minute crowded Lecidea); crust inde- 

 terminate somewhat gelatinous minutely granulose uneven 

 sooty-brown, apothecia minute dull brownish-black pale within 

 at length convex, the border narrow evanescent. JBorr. — 

 Ach. Syn. p. 26. Borr. in E. Bot. t.21\\. 



On the surface of squared rails of oak and deal at Esher, Surrey, and 

 Henfield and Boxgrove, Sussex. Mr. Borrcr. — " It requires a practised 

 eye to distinguish this species from other obscure Lichens, which usually 

 grow on rails ; but its structure is found, upon examination, to be pecu- 

 liar. It has a near affinity to L. idiginosa." Borr. 



29. L. simplex, Borr. Mss. (simple black- shielded Lecidea); 

 crust olive thin smooth scattered soon disappearing, apo- 

 thecia scattered or crowded olive-black with a thick elevated 

 blackish border at length rugged and contorted. Sm, — Lichen 

 simplex, Dav. in Linn. Trans, v. 2. p. 283. t. 28. f. 2. E. 

 Bot. t. 2152, (the figure on slate-rock). — Opegrapha Persoonii, 

 (3. Ach. Syn. p. 71. 



On slate and sandstone rocks, in various parts of Great Britain. Sm. 



30. L. immersa, Ach. (sunken Lecidea); crust spreading thin 

 subcontinuous whitish, apothecia plano-convex immersed in the 

 stone bordered black, the disk subpruinose blackish-red when 

 moist, at length rather convex whitish within. Ach. Syn. p. 27. 

 — Lichen immersus, With. — E. Bot. t. 193. 



On calcareous rocks. — In general appearance, this Lichen is vcrv 

 closely allied to Ferrucaria Schraderi; but the apothecia arc those of a 

 Lecidea. 



31. L. riruliisa, A<h. {branching -lined Lecidea); crust brown- 

 ish-grey cracked bordered ami intersected by aark serpentine 

 branching lines, apothecia scattered sessile black flat with a wai y 



border of their own substance but somewhat paler. Sm. — 



Ach. Syn. p. 28. — Lichen rivulosus, E. Bot, t. 1737. 

 ( )n rocks, frequent. 



32. L. pruindsa, Ach. Moth, (frosty-shielded Lecidea); crnsl 

 Leprous thin scattered greyish-white, apothecia Blightly conyes 

 irregularly shaped rusty-black with a grey bloom when dry and 

 athin black smooth border. S///. — Lichen prvinosus, Dicks. Or, 

 I io. 3. p. 15. t. 9./ i. E, //<>/./. l'l' -4 4. — Lecidea albo-cwrules- 

 <i ns\ , \ck. Syn, p. 29. 



Limestone wall Dear Gainford, Durham, /»'< *. Mr. Harrimatt. 



33. I,, abiettna, Ach. (Spruce-bark Lecidea); crust spreading 

 vcrv thin smooth even pale-glaucous, apothecia sessile nattisn 



HaeV clothed with pale powder, their border black. S*U — 



