Lichenological Contributions in Honour of David Galloway. I. Kärnefelt (ed.): Bibliotheca Lichenologica 95:429–457. J. Cramer in der Gebrüder Bornträger Verlagsbuchhandlung, Berlin · Stuttgart, 2007. A first assessment of the TICOLICHEN biodiversity inventory in Costa Rica: the genus Coccocarpia (Peltigerales: Coccocarpiaceae) Robert LÜCKING 1 , André APTROOT 2 , José Luis CHAVES 3 , Harrie J. M. SIPMAN 4 & Loengrin UMAÑA 3 1 Department of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, IL 60605-2496, USA; email: rlucking@fieldmuseum.org 2 ABL Herbarium, G.v.d. Veenstraat 107, NL-3762 XK Soest, The Netherlands; email: andreaptroot@wanadoo.nl 3 Laboratorio de Hongos, Instituto Nacional de Biodiversidad (INBio), Apdo. 22-3100, Santo Domingo de Heredia, Costa Rica; email: jchaves@inbio.ac.cr; lumana@inbio.ac.cr 4 Botanisches Museum Berlin Dahlem, Königin-Luise-Strasse 6-8, D-14191 Berlin, Germany; email: h.sipman@bgbm.org Abstract: The genus Coccocarpia is treated as part of the ongoing TICOLICHEN biodiversity inventory in Costa Rica, including a thorough revision of all the material reported by Dodge and held at the Farlow Herbarium (FH). Eighteen species are distinguished, among which four taxa are described as new: Coccocarpia gallaicoi Lücking, Chaves & Umaña (with the non-isidiate counterpart C. aff. gallaicoi), C. microphyllina Lücking & Aptroot (phyllidiate relative of C. epiphylla), C. neglecta Aptroot & Lücking (differing from C. domingensis by its squamiform isidia), and C. prostrata Lücking, Aptroot & Sipman (related to C. stellata but with ascending, fruticulose secondary lobes). The name C. guimarana (Vain.) Swins. & Krog is reinstated for a species with narrow, isidiate lobes. Two further, possibly undescribed species are tentatively identified as C. aff. gallaicoi Lücking, Chaves & Umaña and C. aff. imbricascens Nyl. Six taxa, viz. Coccocarpia adnata L. Arvidss., C. dissecta Swinsc. & Krog, C. epiphylla (Fée) Kremp., C. filiformis L. Arvidss., C. glaucina Kremp., and C. tenuissima Tuck., are reported for the first time from Costa Rica. Coccocarpia adnata and C. glaucina are also new records for the Neotropics, and C. filiformis is new to Central America. Analysis of the available material shows ecological differentiation between species: Coccocarpia erythroxyli and C. palmicola have a wide ecological amplitude, being found from (semi-) arid to perhumid situations and from sea level to the subparamo zone at 3500 m, while Coccocarpia dissecta is mostly a lowland species typical of (semi-)arid to humid climates. The other taxa are confined to humid climates; while C. guimarana, C. glaucina, C. neglecta, and C. tenuissima seem to prefer lowland to submontane zones, the remaining species are chiefly montane, with C. domingensis, C. filiformis, C. pellita and C. prostrata reaching the subparamo zone. Coccocarpia as a whole is most abundant and most diverse in humid to perhumid, lower montane to montane situations, and the species generally prefer semi-exposed to exposed (micro-)habitats. 429