Bulletin of the British Museum (Natural History)
Bulletin of the British Museum (Natural History)
Bulletin of the British Museum (Natural History)
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LICHEN GENUS MICAREA IN EUROPE 89<br />
The principal habitats (I-XI) in which Micarea spp. are found are given below; each is<br />
provided with a list <strong>of</strong> <strong>the</strong> species which can be expected to occur in it (allowing for climatic and<br />
phytogeographical variations). Species given in square brackets [ ] are rarely and unusually<br />
found in <strong>the</strong> given habitat, and those prefixed with a dagger (t) are not known in this habitat<br />
from <strong>the</strong> <strong>British</strong> Isles.<br />
I.<br />
Sheltered, dry underhangs, usually in valley woodland or narrow ravines, including dry undersides<br />
<strong>of</strong> up-ended tree root systems in woodland; growing on rock, loose stones, consolidated soil, and<br />
exposed roots.<br />
M. bauschiana M. myriocarpa<br />
M. botryoides M. sylvicola<br />
M. lignaria M. tuberculata<br />
M. lutulata<br />
II. Exposed parts <strong>of</strong> sheltered rocks, usually in woodland; more frequently wetted than I; growing<br />
directly on rock.<br />
M. botryoides M. sylvicola<br />
tM. curvata [M. cinerea]<br />
M. lignaria s. lat. [M. denigrataj<br />
M. lithinella '\IM. muhrii]<br />
M. melaena [M. nitschkeana]^<br />
M. olivacea [M. prasina]<br />
M. peliocarpa<br />
a, stones amongst Calluna in heathland.<br />
III. Over bryophytes on rocks, boulders, old stumps, or fallen trees in woodland at low altitudes (500 m<br />
in <strong>the</strong> <strong>British</strong> Isles).<br />
M. adnata M. lignaria s. lat.<br />
M. botryoides M. melaena<br />
M. cinerea M. peliocarpa<br />
M. leprosula M. prasina<br />
[M. stipitata]<br />
IV. Exposed, hard siliceous rocks; growing directly on rock.<br />
M. intrusa tM. subviolascens<br />
M. lignaria M. aff . ternaria^<br />
M. subnigrata<br />
b, coastal districts only.<br />
V. Over bryophytes or peaty debris on exposed turf or on, or amongst, rocks and boulders in open<br />
situations in upland, montane, or 'arctic' districts.<br />
M. assimilata M. peliocarpa<br />
tM. crassipes M. subleprosula<br />
M. incrassata tM. ternaria<br />
M. leprosula M. turfosa<br />
M. lignaria s. lat. [M. cinerea]<br />
M. melaena<br />
VI. Over bryophytes or plant debris on <strong>the</strong> ground in old dunes, disused lead and zinc mines, sea-cliffs,<br />
or by woodland tracks.<br />
M. botryoides M. prasina<br />
M. leprosula [M. denigrataj<br />
M. lignaria s. str. flM. misella]<br />
M. peliocarpa<br />
VII. On bare mineral soil at low altitudes.<br />
tM. melaenida [M. lignaria]<br />
tM. osloensis [M. prasina]<br />
[M. leprosula]<br />
VIII. Corticate trunks <strong>of</strong> healthy trees; usually in woodland; sometimes overgrowing bryophytes (*).<br />
*M. alabastrites *M. pycnidiophora<br />
*M. cinerea *M. stipitata