A fruticose species with long (4-7 cm., occasionally longer) cylindrical branches, ca. 1mm diam. and dark-brown to black in colour (but the tips paler). Lateral spinules 2-7mm long are numerous, arising at right-angles to the main stems. Soralia are present arising from pseudocyphellae. Soredia are often sparse, but a characterisic of the species is that they are mixed with short spinules arising in tufts from the soralia. Apothecia and pycnidia are unknown.
Chemical Tests: C-, K-, KC-, Pd-
This is a well-defined species characterised by its soredia mixed with short spinules and the Pd- chemical reaction. It most resembles B. bicolor, but that species lacks soralia, is Pd+ red and rarely grows on trees.
On ancient trees of Quercus robur in sheltered but rather well-lit situations. Also occasionally on rocks.
Scandinavia, , C. Europe, Asia, Hawaii. S.W. England (Devon and Dartmoor). According to the lichen flora (2009) probably extinct in Scotland and Wales.
|Location||Grid Reference||Last Rec'd||Recorder(s)||SSSI|
|Caernarfon: "New Glyder"||SH 65||1788||?|
|Meirionydd: Moel y Ffridd||SH 54||1923||D.A. Jones||?|
|Meirionydd: Llyn Bodlyn||SH 62||1877||T. Salwey||No|
|Meirionydd: "Lake above Llyn Bodlyn"||SH 62||1862||W. Borrer||No|
|Meirionydd: Cwm Mawr||SH 635 319||1959||S.A. Manning||Yes?|
"Lake above Llyn Bodlyn" - this could be Llyn Dulyn at SH 662 244
"Moel y Ffridd" - I've scanned by eye SH54 in 0S 1:10,000 map in Mapinfo but couldn't find Moel y Ffridd (Alan Hale).
"New Glyder" - "on montane boulders
UKBAP Signposting Actions:
|1.||Welsh sites need to be visited and the species searched for. Also, continue a follow-up to monitor the B. smithii sites at Black Tor Copse - very important, as these seem to be the last surviving populations known at present.|
|2.||Monitor habitat and species, at least every 6 years, at extant sites to ensure that nitrogen deposition is controlled and that boulders are not shaded to to low grazing levels.|