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MYCOTAXON Volume 101, pp. 25–27 July–September 2007 Cladonia lutescens, a new lichen species from the Himalayas Teuvo Ahti1, D.K. Upreti2* & S. Nayaka2 Department of Ecology and Systematics, P.B. Box 47, FIN–00014 Helsinki University, Finland 1 * upretidk@rediffmail.com Lichenology Laboratory, National Botanical Research Institute Rana Pratap Marg, Lucknow – 226 001, India 2 Abstract—A new lichen species, Cladonia lutescens, is described from the state Himachal Pradesh, India. It contains usnic and homosekikaic acids and presumably belongs to sect. Cocciferae. Key words—Lecanorales, fruticose lichen Introduction In 2002 the author Ahti visited the National Botanical Research Institute, Lucknow, India, to study the large Indian collections of the lichen genus Cladonia deposited in the herbarium (LWG) of that institute. Some of the results of this survey, including a few new species, have been published (Ahti et al. 2002, Ahti & Upreti 2004) and more data will be published in a forthcoming book by Awasthi. Meanwhile, fieldwork by D.K. Upreti and others revealed the presence of one more unknown species, which is described below. Cladonia lutescens Ahti, Upreti & Nayaka, sp. nov. Mycobank # MB510477 Fig. 1 hallus primarius inconspicuous, minute squamulosus, infra mox sorediosus. Podetia 0.3– 1.5 cm alta, valde gracilia, simplicia vel raro parce ramosa, lutescentia, initio ascyphosa, subsubulata, demum apice scyphis angustis, farinoso-sorediosa, basi parce corticata. Apothecia non visa sed primordia ascogonialia ochracea. Conidiomata ochracea vel nigrescentia, terminalia. Acidum usnicum et acidum homosekikaicum continens. Etymology: Referring to the yellowish colour of the thallus. Typus: INDIA, Himachal Pradesh, Kinnaur District, Chitkul forest area, 3000–4000 m, on bark, 04-11-2003, D.K. Upreti, R. Srivastava and P.S. Kunwar 03-002716 (LWGholotype; H-isotype). 26 ... Ahti, Upreti & Nayaka Primary thallus inconspicuous, squamulose, persistent, ascending, cream to yellowish grey, squamules 0.3–1.5 mm wide, 250–280 µm thick, rotund, margin smooth or incised, granular sorediate with age, soredia developing from below, upper cortex 20–30 µm thick, lower cortex absent. Podetia clearly cream yellow to yellow, 0.35–1.5 cm tall, 0.2–0.8(–1) mm thick, unbranched to rarely sparsely branched or proliferating at tips, with closed axils, tapering towards the tips, apically blunt or widening to produce irregular, very shallow, closed scyphi; surface corticated at base up to 0.5–2 mm, otherwise ecorticate, farinosely sorediate; soredia 20–40 µm in diam.; small podetial squamules may be present at the base. Cortex 30–120 µm, medulla 10–30 µm, stereome 20–90 µm, central cavity 110–230 µm, necrotic tissue not melanotic. Hymenial discs not seen but ascogonial primordia developed on margins of scyphi or escyphose tips, ochraceous to brownish, 0.08–0.2 mm in diam. Conidiomata ochraceous to black, terminal on the podetia, conidia not seen. Chemistry: K+ yellow, C–, KC+ yellow, P–, UV–; usnic acid and homosekikaic acid present (TLC, solvent system A; Walker & James, 1980). Distribution and ecology: Cladonia lutescens is a corticolous species found abundantly on coniferous (apparently Pinus) tree trunks at the type locality in Himachal Pradesh in the Himalayas at 3900–4000 m. Additional specimen (paratype) examined: India, Himachal Pradesh, Kinnaur District, Chitkul forest area. 3000–4000 m, on bark, 04-11-2003, D.K. Upreti, R. Srivastava and P.S. Kunwar 032728 (LWG). Remarks: Cladonia lutescens apparently belongs to the traditional section Cocciferae, which predominantly contains red-fruited species, but also includes several ochraceous-fruited members. One very similar species is C. bacilliformis (Nyl.) Glück, which is widespread on conifers in the boreal zone. However, it produces barbatic acid besides usnic acid, never homosekikaic acid. Its scyphi are also deeper and it seems to be more intensely yellow in colour than C. lutescens. Acknowledgements We are thankful to the Director, National Botanical Research Institute, Lucknow for providing the necessary laboratory facilities to work, to the Ministry of Environment and Forests, New Delhi for financial support, to Drs. Harrie Sipman and Ana Rosa Burgaz for their useful comments. Cladonia lutescens from the Himalayas ... 27 Figure 1. Habit of Cladonia lutescens (holotype, bar = 0.5 cm) Literature cited Ahti T, Dixit PK, Singh KP, Sinha GP. 2002. Cladonia singhii and other new reports of Cladonia from the eastern Himalayan region of India. Lichenologist 34: 305-310. Ahti T, Upreti DK. 2004. Two new species of Cladonia (Lecanorales) from the Himalayas. Bibliotheca Lichenologica 88: 9-13. Walker FJ, James PW. 1980. A revised guide to microchemical techniques for the identification of lichen products. Bull. Brit. Lich. Soc. 46: 13-29.