. Bulletin of the British Museum (Natural History). Botany; Botany. 90 H. KROG & T. D. V. SWINSCOW 29. Parmelia jacarandicola Krog & Swinscow sp. nov. Fig. 14 Thallus corticola, griseus. Lobi 1-2 cm lati, crenati, ciliis 0*5-2 (3) mm longis, superne leviter maculati. Soralia isidiaque nulla. Apothecia submarginalia, stipitata, disco perforate Spori 15-16 x 8-10/zm. Conidia filiformia, 10-15 /im longa. Acidum gyrophoricum, acidum psoromicum, et atranorinum continens. Thallus corticolous, loosely attached, pale grey. Lobes 1-2 cm broad, crenate, ciliate, cilia 05-2 (3) mm long. Upper sid
. Bulletin of the British Museum (Natural History). Botany; Botany. 90 H. KROG & T. D. V. SWINSCOW 29. Parmelia jacarandicola Krog & Swinscow sp. nov. Fig. 14 Thallus corticola, griseus. Lobi 1-2 cm lati, crenati, ciliis 0*5-2 (3) mm longis, superne leviter maculati. Soralia isidiaque nulla. Apothecia submarginalia, stipitata, disco perforate Spori 15-16 x 8-10/zm. Conidia filiformia, 10-15 /im longa. Acidum gyrophoricum, acidum psoromicum, et atranorinum continens. Thallus corticolous, loosely attached, pale grey. Lobes 1-2 cm broad, crenate, ciliate, cilia 05-2 (3) mm long. Upper side smooth to pitted, rugose and cracked towards the centre of the thallus, faintly maculate. Medulla white. Underside black, with a broad, brown to mottled, naked marginal zone, rhizines fairly coarse, in scattered groups. Soralia and isidia absent. Apothecia submarginal, stipitate, up to 12 mm in diameter, thalline exciple rugose, exciple and stipe strongly maculate, thalline margin smooth, disc perforate, spores 15-16 x 8-10 jum, thin-walled. Conida filiform, 10-15 //m long. TLC: gyrophoric acid, psoromic acid (+), atranorin. Type: Kenya. Rift Valley, Nakuru [0° 17' S, 36° 5' E], on trunk of Jacaranda, 21 March 1968, leg. Gunnar Gilenstam no. 2004 (UPS—holotype, O—isotype). Parmelia jacarandicola may superficially resemble P. maclayana, which, however, has sublageniform conidia and different chemical properties. Parmelia euneta differs in its larger spores, distinct maculae, and absence of psoromic acid. The production of psoromic acid is associated with the apothecia. Fertile lobes and the thalline exciple give a PD+ sulphur yellow reaction in the cortex, whereas the medulla reacts PD—. If a sterile lobe is tested with TLC, the presence of psoromic acid may go undetected. Parmelia jacarandicola may possibly be considered the parent morph of P. direagens, a sorediate species in which psoromic acid is associated with the soralia. However, there is a discrepancy in the c
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