372 DR. LAUDEB LIXDSAT OK THE 



44. L. hadiay Acli. {Lichen picimcs^ Dicks.). SaxicolouSj Havna- 



fjord. 



45. L. atra, Ach. Saxicolous. 



46. Lecidea foveolaris^ AVhlnb. Terricolous, Eeykjavlk moors ; on 



soil in crevices of rocks on the coast cliffs, Videj. 



47. Z, simplicior^ XyL MS, Muscicolous, Laugarness moors. 



Closely allied to, if not a mere variety of, Z. sabuletorum^ 

 rik., and L. sphcsroideSj Smrf. 



48. Z. timhrina, Acli. Saxicolous, Eeykjavik. 



49. Z. bacilllfera, jN^yL, var. stihfuscula, Nyl. (in ' Flora,' 1865, 



p. 604). Terricolous, Laugarness moors. The type is cor- 



ticolous in Sweden and Finland. It includes as a variety 



t Borrer's Z. iiicompta (E. Bot. Suppl. t. 2699 ; Leighton's 



Lichenes Britannici Exsicc. no. IG^, Jide Nyl. Scand. 210). 



50. Z. parasema, Ach., in various forms. Saxicolous, very common. 

 Yar. latypea^ Ach, (Z. coniops, Ach. pr. p.), 



Var. enferoleiica, Ach. (Z. dubia, Borr.). 



Yar. monticola^ Ach. (var. nitidula, Fr., NyL). Saxicolous, 



Eeykjavik. " Sporae longit. 0-010-0-014 millim., crassit. 



0*0015-0-0050 millim. ; hypothecium fusco-rufescens : ge- 



latina hymenea iodo ca^rulescens" (Nyl. Letter, Feh. 9, 



1866). 

 Yar. incongrua^ IS"yL MSS. Descrihed as a separate species in 



Ts^'yl. * Scand.' 218. 



51. L. vitellhiaria, IS'yl. On boulders with rounded surfaces: 



specimens not obtainable. Probably to be considered a 

 mere parasitic and athalline form of the preceding. 



52. Z. alpestins, Smrf. Terricolous, Laugarness moors. 



53. Z. contigua^ Fr. Saxicolous. 

 'Y^\\Jlavicunda,kQki.^\\\t\ isidioid forms. Saxicolous,Havnafjord. 



51. Z. conjluens, Ach., various forms. Saxicolous. Apt to be 



confounded with, and properly, I think, referable to, the 

 preceding and succeeding, from which it appears to possess 

 no good title to be considered distinct. Thallus in all three 

 lichens occasionally ferruginous or rust-coloured. 



55. Z, lapicida, Fr., and vars. dcclinans, Xyl., and ocliromeU, Ach. 



Saxicolous, common. 



5Q, Z. pohjcarpa, Flk. Allied like the following to the preceding. 



Saxicolous, very common, 



.57. Z. liiliopliila^ Ach. Saxicolous, very common. 



Form ocliracea^ Ach., according to Fries and JS'y lander (Scand. 

 227) is Lichen pruinatiis, Dicks. (E. Bot. t. 2244). 



58. Z. areolata, Schspr. Saxicolous. - 



