Mr. Hardy on Lichens of the Eastern Borders. 423 



on the sea-banks between St. Helen's Church and Siccar-point, in spring. It 

 does not differ from the state on limestone. In Switzerland it also occurs on 

 other than calcareous rocks; " rarius ad arenaria et qiiariosa," is Schaerer's 

 notice, and Koerber makes a similar remark. 



70. Spliaerompliale, Rekhenhach. 



I. S. UMBRINA, Wahlh. On submerged indurated rocks in rivers, &c., in 

 mountainous districts. N. On blue whin in the College water, where it leaves 

 the Henhole ravine ; on porphyry below a waterfall among the rocks on the west 

 side of Care-burn ; and also in the upper part of the Lill-burn. B. On indurated 

 slate rocks on the Whitadder below E din's Hold. 



71. Segestrella, Fries, 



1. S. LECTTSSiMA, Fries. N. On the Cheviot syenite in the bed of the Cold- 

 gate water, above Langleyford Hope ; I also traced it up to Harthope Linn, 

 where it appears to occupy the place of the aquatic Verrucariae. 



72. Yerrucaria, Wigg. 



1. V. MAURA, Wahlh. On rocks along all the sea-coast of Northumberland, 

 North Durham, and Berwickshire, common. At Siccar point on slaty rocks 

 washed by the sea the crust is of a smooth green greasy colour. Finely in fruit 

 on greywacke at the west end of St. Abb's Head. 



2. V. AQUATTLis, Miidd. On overflowed stones in streams. N. In the Lill- 

 burn, among the rocks on the west side of Care-burn, and at Routin Linn. B. 

 In the Whitadder at the Retreat, and in the burn at the Blackburn-rigg Wood. 



3. V. HYDRELA, Ach. On overflowed stones in streams. B. In the AVhit- 

 adder above the Retreat, and in the burn in Blackburn-rigg Wood. This 

 agrees with specimens I have from Miss Atwood from the Water Winch near 

 Tenby ; but in hers the apex of the apothecia is better displayed. 



4. V. CHLOROTICA, Ach. On rocks and stones in streams, overflowed with 

 water. N. In the Lill-burn, among the rocks on Care-burn, Routin Linn. B. 

 In Dowlaw burn, in burns in Penmanshiel Wood, Pease and Cockburnspath 

 Tower burn, Whitadder, &c. A beautiful object in the water ; being of a 

 tender emerald green. 



5. V. SUBMERSA, Borr. On partially inundated rocks and stones in running 

 water. N. In the Lill-burn, and in a stream among the rocks on Care-burn. 

 B. In the Whitadder above the Retreat, and in Dowlaw burn below the Linn. 

 Koerber regards this as a variety of the preceding. 



6. V. L^VATA, Ach. On partially submerged rocks in streams. N. In the 

 Lill-burn, and on Care-burn, B. On rocks on the Whitadder, and in Whare- 

 burn ; also in Dowlaw dean, &c. 



7. V. POLYSTICTA, Borr. B. A minute triangular fragment on conglomerate 

 from the sea-banks at Greenheugh, agrees exactly with the plant as it grows in 

 Sussex, as sent by the Rev. T. Salwey. 



8. V. PUSCELLA, Turn. B. On old mortar and stone-walls at Penmanshiel ; 

 not common. 



9. V, NiGRESCENs, Pcrs. On rocks and stone-walls in open places. N. On 

 limestone at Ratcheugh, on calcareous spar at Humbleton Mill, and on calcareous 



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