. Bulletin of the British Museum (Natural History). Botany; Botany. 198 H. KROG & T. D. V. SWINSCOW TLC: alectoronic acid, ± or-collatolic acid, ± gyrophoric acid, atranorin. Saxicolous forms at high altitudes are extremely coriaceous, with short, coarse cilia, while corticolous specimens in the montane forests usually have a thinner thallus and longer, more slender cilia. This variation seems to be environmentally induced and is not correlated with the presence or absence of gyrophoric acid. Laminal lobules, which were one of the characteristic features of P. lobulascens Steiner, the puta
. Bulletin of the British Museum (Natural History). Botany; Botany. 198 H. KROG & T. D. V. SWINSCOW TLC: alectoronic acid, ± or-collatolic acid, ± gyrophoric acid, atranorin. Saxicolous forms at high altitudes are extremely coriaceous, with short, coarse cilia, while corticolous specimens in the montane forests usually have a thinner thallus and longer, more slender cilia. This variation seems to be environmentally induced and is not correlated with the presence or absence of gyrophoric acid. Laminal lobules, which were one of the characteristic features of P. lobulascens Steiner, the putative sorediate morph of P. diversa, are found in specimens with or without gyrophoric acid. The intermediate spores with a rather thick spore wall as well as the filiform conidia are the same for both chemotypes. We consider gyrophoric acid to be an accessory substance in this case and regard P. diversa as conspecific with P. nilgherrensis. Parmelia maclayana differs from P. nilgherrensis in its emaculate upper cortex, smaller spores, sublageniform conidia, and different ecological requirements. Parmelia nilgherrensis is a species of the montane forests, the ericaceous zone, and the low alpine zone; it has been collected between 2000 and 3600 m altitude, but is most common above 2800 m. The gyrophoric acid strain is most widespread in Ethiopia. We have seen only two additional specimens, one from Kenya and one from Tanzania. Outside our area the species is known from Sikkim, India, Sri Lanka, China, and Thailand (Hale, 1965, Fig. 28). Selected East African records Ethiopia. Bale Province, Gasore Summit, Tapper 960a, 962 (BM). Begemder Province, Semen Nat. Park, Geech plateau, Heinonen 1187 (H). Chokke Mts, north of Debra Marcos, C. B. E. E. 34 (BM). For further Ethiopian records, see Winnem (1975) under P. diversa and P. nilgherrensis. Kenya. Central Province, Nyeri District, Mt Kenya, W side, Naro Moru track, K 28/122, 520, Aberdare Mountains, near Karuru-Gura waterfalls, 3K
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