418 Mr. Hardy on Lichens of the Eastern Borders. 

 58. Opegrapha, HumloUt. 



1. O. SAXATILIS, D. C. D. " On sandstone rocks at Hudshead, and on stone- 

 walls in the vicinity, abundant." Br. Johnston. N. Calcareous spar, Humble- 

 ton Mill ; sandstone, Ratcheugh ; Bamborough Castle. B. On sandstone at 

 Greenheugh, and walls at Oldeambus ; greywacke at Black Craig, Pease dean, 

 in Dowlaw dean, and below the " Deil's Dander," Coldingham. 



2. 0. VARIA, Pers. a. pdlicaris, Lightf. Sub-var. h. notha, Ach. On the 

 trunks and about the roots of old trees with thick barks. B. On the wood of 

 old hollies, and bark of old sycamores and oaks, Penmanshiel Wood ; bark of 

 old ash trees at Piperton ; and of old trees, Ketreat. e. iigrina, Ach. On 

 bark of sycamore, Penmanshiel "Wood. /. tridens, Ach. N. On hawthorn, 

 Homilheugh, and alders, Langleyford Hope. 



|3. DIAPHORA, Ach. N. On hazel on the Lill-burn. B. Hoots of oak, Bow- 

 shiel dean ; on mountain ash, Dowlaw and Brockholes deans. 



7. RiMALis, Fries. N. Old ash trees near Heathpool. B. Beech and ash 

 trees, Blackburn-rigg "Wood. 



3. 0. TuRNERi, Lcight. B. On the bark of hazel, Penmanshiel "Wood, Bow- 

 shiel and Brockholes deans, not common. 



4. O. ATRA, Pcrs. Common on young ashes, oaks, hazels, &c., everywhere. 

 The rarest form is parallcla, Leight. N. On ivy at Heathpool, B. On moun- 

 tain ash and birch, Penmanshiel "Wood, and Bowshiel dean. 



5. O. VULGATA, Ach. Not uncommon on various trees in shady localities, 

 N.andB. " The sub-var. 5/e«ocar/»a, Ach., occurs with the common state. Dr. 

 Johnston's O. notha, Ber. Flor. ii. p. 100, is from the Rev. "W. A. Leighton's 

 examination of the typical specimen, O. vitlgata, var. vulgata, Schaer. See also 

 Leighton's British Graphideae, p. 23. The specimen is on ash bark, and con- 

 sists of very minute, short, scattered apothecia. 



(3. DUBIA, Le'ighi. On wood in clefts of the bark of oak and birch. Pen- 

 manshiel Wood and Bowshiel dean. 



7. siDERELLA, Ach. On the trunks of smooth barked trees in shady woods, 

 generally near the ground, frequent. N. On oak and hazel, Routin Linn ; and 

 on alder and ash at Heathpool. B. On holly, hazel, birch, aspen, oak, and ash, 

 Penmanshiel Wood, and on similar trees in Bowshiel and Dowlaw deans, ex- 

 hibiting several pretty sub-varieties. Some of my friends take this for rufes- 

 cens, but its lirellee are nearly all superficial, and not innate as in that form of 

 hcrpetica. 



6. O. HERPETICA, Ac7i. 7. ELEGANS, Boi'r. "Very rare. B. On bark of ash 

 in Bowshiel dean. This is the only instance of the true plant being found in 

 the district. 



59. GrapMs, Adansori, 



1. G. ANGXJINA, Mont. a. DIFFUSA, Leight. On mountain ash, holly, hazel, 

 beech, and oak, Penmanshiel Wood, &c. In a very diminutive state on bilberry, 

 Bowshiel dean. 



(3. FLExuosA, Leight. On oak near Penmanshiel ; hazel, Dowlaw dean ; oak 

 and elm, Blackburn-rigg Wood. 



7. KADiATA, Leight. On hazel, ash, oak, bird-cherry, and other trees, com- 

 mon. 



