tn) THE LICHENS. 69 
stratum. The Coniocarpi and Graphideales are chiefly corticolous plants but they 
are also mainly temperate if not still more, tropical species. Most of the larger 
genera as Cl/adonia, Sphaerophoron, Parmelia, Usnea, Ramalına, Peltigera, Sticta, 
Stictina and others are also on the whole plants which prefer warmer climes and 
they also seem to depend on some kind however small it may be of organic sub- 
stratum. In the true antarctic regions any organic substratum is of the very rarest 
occurrence, especially of such a kind as to allow the growth of such Lichens, which 
prefer such a substratum. The species of Gyrophora are clearly the hardiest of 
foliaceous species and we therefore find them growing on the bare face of a rock 
where there cannot be any trace of organic material. The same is the case with 
species of Neuropogon. 
Addition and alteration. 
1. During the printing of this report the following additional species has been 
found among the material of the swedish South Polar Expedition: 
Physcia pulverulenta (SCHREB.) Nyı. — TH. FR. Lich. Scand. p. 136. 
Literature: DARBISH. Fram, p. 40. — HELL». N. Z. p. 49. — HuE Lich. Exot. No. 983. 
Distribution: Eastern Asia; Northern America; Northern Africa; Europe; New Zealand. 
Locality: Antarctis (25*). — Over moss and earth, in fruit. 
Note: This species has not been entered in any of the lists given in this report, 
neither has it been taken into account in any of the statistical reviews. The species 
of lichens from the antarctic region now therefore number 107. 
2. The locality in which Verrucaria exguisita was found was first incorrectly 
stated as being the Falkland Islands. Throughout the report and in all the lists it 
has been corrected to South Georgia (18). It was however found impossible anymore 
to take this species into account in the statistical tables. These would have to be 
altered almost throughout, and under the circumstances such an alteration would not 
be a matter of great importance as the figures must obviously, for the present at 
any rate, be only approximately correct. Leaving out this species does not materi- 
ally detract from the value of the figures. By the transference of Verrucaria ex- 
quisita the number of Lichens recorded from South Georgia rises to 56, that from 
the Falkland Islands sinks to 365. 
