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22 August 2016 First inventory of lichens from the Brazilian Amazon in Amapá State
Marcela Eugenia da Silva Cáceres, André Aptroot
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Preliminary results are presented of a lichen exploration in Amapá State in Brazil. The following new species are described: Absconditella termitariicola with apothecia immersed to emergent, often partly covered by the thallus, 0.15–0.25 mm diam., pale ochraceous; asci pyriform; ascospores 1-septate, 10–12 × 4.0–5.0 μm, Astrothelium lineatum with orange thallus with orange, often linear pseudostromata with immersed ascomata in groups of 3–15; ascospores 8/ascus, hyaline, regularly muriform, 45–55 × 11–13 μm, without distinctly thickened median septum, Astrothelium unisporum with thickly corticate thallus, high, thallus-covered pseudostroma warts with 1–4 ascomata; ascospores 1/ascus, muriform, 125–148 × 35–42 μm, Coenogonium minidenticulatum with apothecia 0.2–0.4 mm diam., usually distinctly denticulate; ascospores 6–7 × 1.0–1.5 μm, with rounded ends, Crypthonia corticorygmoides with olive green felty thallus, up to 1 cm large white stromatoid-like ascigerous areas and 3–5-septate clavate ascospores of 25–29 × 5–6 μm, Cryptothecia rhizophora with white thallus with long, branching, superficial rhizomorphs of up to 0.2 mm wide, which reach until in the prothallus and ascigerous areas with lichexanthone; ascospores 85–95 × 32–37 μm, Endocarpon riparium with thallus consisting of dense agglutinated flat squamules which are not overlapping, with margins and cracks with numerous 0.1–0.2 mm diam. dorsiventral lobules of thallus-structure that are easily detached and serve as asexual propagules, Psammina tropica with sporodochia abundant in the central part of the thallus, absent in a marginal zone of 1–2 mm wide, whitish grey, irregular to rounded, ca. 0.1–0.3 mm diam., only ca. 15 μm high; conidia hyaline, palmate, with 3–6 arms, each of which are 4–7-celled, ca. 20–25 μm diam., consisting of cells of ca. 2.5–3.0 μm, Thelenella monospora with shiny grey thallus, low conical thallus-covered ascomata and ascospores 1/ascus, hyaline, ellipsoid, irregularly muriform, 75–90 × 25–28 μm, and Thelocarpon triseptatum with minute pallid perithecioid ascomata with flat tops, hamathecium thin anastomosing paraphysoids; ascospores 8/ascus, 3-septate, 12–16 × 3.5–4.5 μm. A further 209 species are reported new to Amapá State, eight are new to the Neotropics, one is new to South America and a further seven are new to Brazil. In Amapá, just as in Rondônia, Astrothelium is the most speciose lichen genus, and this may be the case all over the Amazon.

Copyright ©2016 by The American Bryological and Lichenological Society, Inc.
Marcela Eugenia da Silva Cáceres and André Aptroot "First inventory of lichens from the Brazilian Amazon in Amapá State," The Bryologist 119(3), 250-265, (22 August 2016).
Received: 8 May 2016; Accepted: 1 July 2016; Published: 22 August 2016

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