Usnea, Cladonia, Physcia, Parmelia, Calicium, many species of Lecidea, &c., Trentepohlia (Chroolepus) umbrina in many species of Verrucaria, Graphidieae and Lecidea; Palmella botryoides in Epigloea; Pleurococcus vulgaris in Acarospora, Dermatocarpon, Catillaria; Dactylococcus infusionum in Solorina, Nephromia; After Sachs, from De Bary's Vergleichende Morphologie and Biologie der Pilze, Mycetozoen and Bacterien, by permission of Wilhelm Engelmann.
Lecidea), sometimes obsolete, and which are occa sionally irregular in shape, angular or flexuose (e.g.
Lecidea jurana, L.
Lecanora metaboloides, Lecidea decolorans), while sometimes they are white or glaucous, rarely greenish, pruinose.
It is possible that specimens of such long-lived species as Lecidea geographica actually outrival in longevity the oldest trees.
Lecanora calcarea, Lecidea calcivora and several Verrucariae), while all other saxicolous lichens may be regarded as belonging to the latter, whatever may be the mineralogical character of the substratum.
Lecanora Prevostii, Lecidea calcivora) have the power of forming minute cavities in the rock, in which they are partially buried.
Cladonia, Lecidea decolorans), others calcareous soil (e.g.
Lecanora crassa, Lecidea decipiens), others sandy soil or hardened mud (e.g.
Lecidea, Bouteillei, Strigula).
Lecidea vitellinaria) or common to several species (e.g.
The lichen flora of temperate regions again is essentially distinguished from the preceding by the frequency of corticolous species belonging to Lecanora, Lecidea and Graphidei.