*1: Bollogas near
Newlyn, 1841, WC (OXF) (Paton 1969a:
*2: S. of Widemouth,
1961, JAP (BBSUK) (Paton 1969a: 706). [Older
report (Mount Edgecumbe, EL, in Holmes 1906, Castell 1950:
379) not supported by specimen (Paton 1969a:
Commonest as epiphyte, on bark of Ash, Beech,
Blackthorn, Grey Willow, Elder, elm, Gorse, hybrid poplars,
Sycamore. Also recorded three times on Ivy; twice on Cotoneaster
integrifolius; once each on Broom, Hawthorn, Hazel,
Honeysuckle (thick stem, in scrub) and Prunus laurocerasus.
Associates include most of commoner epiphytes (Cryphaea heteromalla,
resupinatum, Metzgeria violacea, Metzgeria furcata, Metzgeria
consanguinea, Orthotrichum affine,
conoideus); also recorded are Colura calyptrifolia,
Neckera pumila, Radula complanata. In
woodland and edges, groves, scrub, Grey Willow
carr. Single record on bark of Grey Willow that is flooded
regularly in upper part of inundation-zone beside
Also occurs as small patches on steep or vertical
serpentinite rock of S.-facing crag, in places overhung by
rock above or partly sheltered by bushes. Likewise on gabbro.
On sheltered granite of boulders, foot-bridge, grave surround,
gravestone, etc. Numerous patches on slaty rocks in vertical
N.-facing wall near coast, lightly shaded by trees. Sheltered
rock of crags near coast and in crack on rocks at top of
exposed sea-cliff (latter with Frullania microphylla
microphylla). In Isles of Scilly frequent on granitic
rocks, mostly in sheltered places. Small patch intermixed with
on calcareous masonry (Minions).
Usual presence of five-sided perianths (all months)
provides useful field character for distinguishing it from Microlejeunea ulicina
which is never fertile in Cornwall.
Commonly c.fr.: immature 1, 3, 4, 6, dehisced 1,
3-5, 8, 9, 11, 12.