(124) 
perhaps safely be referred the larger proportion of our rock-Rinoding. 
—R. Ascociscana (Lecanora, Tuckerm. Suppl. 2, 1. c. p. 204) is a com- 
mon bark-lichen of the White Mountains; and is found also in Massachu- 
setts ; in Vermont (Mr. Frost) in Canada (Mr. Drummond) and in Tlinois 
(Afr. Hall). Mr. Frost, and Mr. Willey observe it also on rocks. Thallus 
squamaceous. Apothecia lecanorine, with crenulate border; 0™™, 6-1™™- | 
wide. Spores 0,025-40™™- long, and 0,011-18™- wide.——R. turfacea 
(Wahl.) Koerb., and the closely akin R. mniarea (Ach.) Th. Fr., are 
earth-lichens of Arctic America (J. Vahl, e Th. Fr. 1. ¢. C. Wright) and 
the former is not uncommon in the alpine region of the White Mountains. 
——R. Bischofii (Hepp) Koerb. Parerg. p. 75, a lichen not without marked 
features, from the calcareous rocks of Germany and Italy, is represented 
here on lime-rocks, in Kansas (Mr. Hall) and in Texas (Mr. Wright). 
Apothecia soon blackening, and looking rather like those of some Lecidea 
or Buellia. Spores (characterized by the wide, dark interstice between 
the spore-cells, looking like a brown band, as noticed by Koerber) 
0,014-20™"- long, and 0,011-14™™- wide, in the lichen from Texas; and a 
little smaller, or about 0,012-18™™- long, and 0,007-9™™- wide, in that from 
Kansas. R. sabulosa, Tuckerm. J. supra c., is a terricoline species from 
California (Mr. Bolander). Spores in eights, from regularly bilocular 
becoming soon, and most commonly quadrilocular; and the two (larger) 
middle cells not unfrequently but irregularly passing into four; 0,024-32™™- 
long, and 0,010-16™™- wide. 
I add here as an appendix, with little hesitation, the myriosporous 
R. constans (Nyl.) described by Massalongo as a distinct generical type 
(Maronea) the minute but at length truly bilocular spores imitating suffi- 
ciently (much as the nucleiform hymenium of Pertusaria does the ma- 
ture fruit of Lecanora) the younger (colourless) condition of the Rinodina- 
type, and the lichen agreeing with this genus generally. The American 
plant is described, under the more recent name of Lecanora Berica, in 
the writer’s Obs. Lich. 1. ¢. 5, p. 403, and is common throughout the 
United States. Its spores are now constricted at the middle; one of the 
best indications perhaps of the coloured spore in its bilocular stage, when 
colour is wanting. 
Sub-Fam. 2.— PERTUSARIEI, Nyjl. 
Apothecia composita, difformia. 
The typically compound and closed receptacles of the crustaceous 
group before us may well appear abnormal as respects Parmeliaceous 
1 It is observed here that ‘ the spores are described as simple by all the authors 
who have remarked on them’; but Arnold (Lich. Frank. Jur.in Flora, 1860, p.71) 
had already noticed in specimens of Maronea Kemmleri, Koerb., that the spores 
were ‘meist mit je 2 Oeltropfehen versehen.’ 
