A world key to Stirtonia (Arthoniaceae), with three new Stirtonia species and one Crypthonia from the Neotropics

SIPMAN HARRIE; KAFFER MARCIA; MARTINS SUZANA; FERRARO LIDIA ITATI

The Lichenologist

Cambridge University Press

Lugar: Cambrigde; Año: 2014 vol. 46 p. 1 - 7

0024 2829

Abstract: A world key to the 21 species of Stirtonia is presented. Three new Stirtonia species aredescribed from the Neotropics: Stirtonia ibirapuitensis Aptroot, Ka¨ ffer & S. M. Martins, with whitishto cream amoeboid ascigerous areas with lichexanthone on a greenish thallus without lichexanthone and ascospores of 27?32  95?125 mm; Stirtonia punctiformis Aptroot & Sipman, with ascigerous structures of thallus colour, consisting of one or more brown asci with brown walls with surrounding tissue, in groups or irregular lines and brown ascospores 61?73  27?35 mm; and Stirtonia viridis Aptroot, L. I. Ferraro, Sipman & M. Ca´ceres, with ascigerous structures mostly linear, branched and anastomosing, whitish, and contrasting with the oftengreenish thallus and with ascospores 50?58  15?22 mm. In addition, a specimen o S.neotropica is reported that contains some patches of lichexanthone, S. curvata is reported new to the Neotropics from Brazil and the Netherlands Antilles, and S. nivea is reported new to the Northern Hemisphere from Puerto Rico. Also, Crypthonia divaricatica  Aptroot & Sipman, with an irregular, thick thallus with divaricatic and usnic acids and flat white ascigerous areas and macrocephalic 5?9-septate ascospores 20?27  95?125 mm is described from Mexico. While only one Stirtonia species was known from the Neotropics as recently as 2009, the totalnumber of Stirtonia species known from the Neotropics is now 12, an equal number to the 12 species that are known from the Palaeotropics.