*2: Tree on mine waste, below
Dimson, near Gunnislake, 1966, JA (Perry 1967: 418, Paton
1969a: 741).
Eight sites are now known in vc2. Z. rupestris can often
be distinguished from Z. viridissimus in the
field because it has a narrower leaf apex, but this is
unreliable and records have only been accepted here based on
microscopic study of the gemmae. In the past, Z. rupestris has apparently been over-recorded by
lichenologists during surveys of parkland inCornwall, since they report
it much more often than Z. viridissimus through
relying on field identifications.
There are only two recent Cornish records for which
habitats have been recorded in detail: on trunk of large old
oak in open deciduous woodland on bank of R. Tamar (with Zygodon viridissimus
var. viridissimus);
on trunk of tree in woodland edge near creek (W. of
Lerryn).
Only recorded with foliar gemmae (which have
colourless cell walls on DTH 01-11, brown on
other specimen); not seen c.fr.