22 THE DISTRIBUTION OF HEPATIC IN SCOTLAND 
at high altitudes; Gymnomitrium concinnatwm is a con- 
spicuous instance of this. 
2. Species occurring on living trees. XEROPHYTES— 
Metzgeria furcata, Ptilidiwm pulcherrimum, Sphenolobus 
ovatus, Radula complanata, Cololejeunea minutissima, 
Microlejeunea wlicina, Frullania dilatata, HEMIXERO- 
PHYTES— Metzgeria conjugata, Acrobolbus Wilsonii, Plagio- 
chila punctata, P. spinulosa, P. tridenticulata, Lepto- 
cythus cuneifolius, Adelanthus decipiens, Madotheca 
levigata, Cololejewnea calyptrifolia (very rarely), Lejeunea 
patens, L. Macvicari, Drepanolejeunea hamatifolia, Harpa- 
lejeunea ovatu. MEsopHYTES—Lepidozia vreptans, Sca- 
pania gracilis, Lejeunea cavifolia, Frullania Tamariset, 
F. germana. 
None of the above are confined to trees, but Leptocythus 
cunerfolius, Lejeunea Macvicari, and Microlejeunea ulicina 
are very rare on other habitats. 
3. Species occurring on stumps and decaying logs. 
MeEsopHyTEs — Aneura latifrons, A. palmata, Lophozia 
ventricosa and var. porphyroleuca, L. guttulata, L. wneisa, 
L. gracilis, Sphenolobus minutus, S. Hellerianus, S. ex- 
sectus, S. exsecteeformis, Leptocyphus Taylori, L. anomalus, 
Lophocolea cuspidata, L. heterophylla, Cephalozia con- 
nivens, UC. lunulefolia, C. leucantha, C. serriflora, Nowellia 
curvifolia, Cephaloziella Starkii, C. trivialis, Odonto- 
schisma denudatwin, Calypogeia Trichomanis, C. fissa, 
C. suecica, Lepidozia vreptans, L. trichoclados, [. setacea, 
Scapania gracilis, S. wumbrosa, Ptilidium pulcherrimum, 
P. ciliare. 
Of the above, Lophozia guttulata, Sphenolobus Helleri- 
anus, and Culypogeia swecica have been found only on 
decaying logs or stumps. 
Some species are confined to decaying wood when on 
the east coast, but when on the west coast they also 
occur on peat. 
4. Species occurring on loamy or turfy banks. Many 
species are found on this habitat, nearly all being meso- 
phytes; the following are xerophytes: Lophozia incisa 
var. Limprichtii, L. bicrenata, Sphenolobus exsecteeformis, 
Cephaloziella Sturkii. 
5. Species occurring on moist fallow ground. Riccia 
