Nomenclatural notes on the lichen genera Leucodecton and Myriotrema (Graphidaceae) in India

Abstract

Nine species of Leucodecton and nine species of Myriotrema are recorded for India. The recently resurrected Leucodecton accommodates species earlier placed in Leptotrema, Myriotrema, or Thelotrema, which were segregated based primarily on medullary chemistry such as stictic and norstictic acids, although Myriotrema retains species with a prosoplectenchymatous cortex and psoromic or protocetraric acid chemosyndromes. This contribution includes new synonyms, changes in generic placement, new species distributions, and new records. Leucodecton compunctum and L. subcompunctum are new records for India.

A re-evaluation of thelotremoidGraphidaceae(lichenized Ascomycota:Ostropales) in India

“…2009; Rivas Plata et al 2010 a ; Joshi et al . 2012 b ). The genus currently includes c. 19 species worldwide and nine species are known from India so far.…”

“…Joshi et al . (2012 b ) reported nine species from India; however, the revised concept of the genus supported the placement of M. masonhalei and M. pertusarioides in Ocellularia , M. glaucophaenum in the newly established genus Glaucotrema , and M. desquamans in Wirthiotrema (Rivas Plata et al 2010 a ; Lücking et al . 2016).…”

“…Recently, Joshi et al . (2012 a , b ) revised Chapsa , Leucodecton and Myriotrema species in India. Following the contemporary nomenclatural changes based on phylogenetic studies worldwide, in addition to the previously studied genera, the present work focuses on the taxonomy of known Indian thelotremoid Graphidaceae , including 24 genera: Asteristion , Astrochapsa , Austrotrema , Chapsa , Chroodiscus , Cruentotrema , Diploschistes , Glaucotrema , Leucodecton , Melanotrema , Myriotrema , Nadvornikia , Nitidochapsa , Ocellularia, Pseudochapsa , Pseudotopeliopsis , Pycnotrema, Reimnitzia , Rhabdodiscus , Sanguinotrema , Stegobolus, Thelotrema , Topeliopsis and Wirthiotrema .…”