Mr. Hardy on Lichens of the Eastern Borders. 417 



A very variable lichen. It occurs with the thallus almost black on the sum- 

 mit of Hedgehope. Pretty varieties with a radiating dendritic hypothallus are 

 met with on the quartz of fragments of rolled gneiss, near the head of Dowlaw 

 dean. These are the Lichen dendrit'icus of Dickson. Dr. P. Neill, in Edin. 

 Encyclopaedia mentions its selecting pure rock crystal, " It grows very ele- 

 gantly on the smooth rocks of white quartz in the Highlands of Scotland," 

 Winch. Several other lichens beside this have a dendritic irradiation of the 

 hypothallus, 



2. K.. GEOGRAPHicuM, L. From the top of Cheviot down to the sea-coast of 

 our rocky shores, common. 



§. SPH^RICUM, Schaer. N. Near Heathpool Linn. B. On the Whare-burn. 



The last lichens collected by Humboldt on Chimborazo above the region of 

 eternal snow were Lecidea geograjihica and Gyrophora rugosa, Ach. Meyen's 

 Report on Vegetable Physiology, 1837, p. 140. 



55. ScMsmatomma, Fw. and Massal. 



1. S. ABIETINUM, Ach. In shady glens, on the roots and stems of old trees, 

 not very common, N, On alders near Coldgate water, below Langlee ; on 

 alder below Langleyford Hope ; on birch at Harthope Linn. B. On birch and 

 oak on the south side of Bowshiel dean ; on old hollies, Penmanshiel Wood. 

 The spermogoniferous state, Pyrenothea leucocephala, accompanies the other. 



|3. MouGEOTii, Pers. " Thallo verrucis in lepi-am deliquescentibus." Schaerer, 

 Enum. Lich. Europ. p. 131, On moss in a very shady nook in Bowshiel dean 

 opposite Edmond's dean. Fries identifies his Biatora campestris with this, but 

 Koerber thinks Fries's plant is either a fungus or the representative of a new- 

 genus of lichens. Be this as it may, our plant is S. abietinum on moss. 



56. DactylOSpora, Koerber. 

 1. D. INSPERSA, Tulasne. Parasitic as small black specks on the thallus and 

 apothecia of Lecanora parella, on red sandstone at Ewe-lairs ; and on greywacke 

 at Lumsden shore, on the Berwickshire coast. 



57. Al)rot]iallllS, De Notaris. 



1, A. Smithii, Tulasne. B. Parasitic on small elevated aggregations of 

 leaflets on old plants of Parmelia saxatilis, common in one place on the top of 

 a stone-wall, Bowshiel dean ; on the same Lichen on a rock, below the Retreat. 

 N. On Parmelia saxatilis, on rocks at Spindleston-heugh, Chesterhill, and on 

 the top of the Sneer-hill ; on P. oinphalodes, at the base of Homilheugh. On 

 Cctraria glauca on the summit of the Sneer-hill occupying curious inflated hol- 

 low processes at the apex of the fronds. C. glauca thus affected is var. lullata, 

 Schaer. Enum. p. 13. Tulasne met with it on P. omphalodes in France ; Dr. 

 Lindsay has not found it on this lichen, and doubts its occurrence there. 

 Monograph of the Genus Abrothallus, p. 10. "We have the varieties ater and 

 pulveruleictus. 



2. A. oxYSPORUS, Tulasne. B. With the preceding in Bowshiel dean. N. 

 On Parmelia saxatilis at Chesterhill ; and on Cetraria glauca, Sneer-hill. My 

 specimens of both were determined by Dr. Lindsay. 



