Myriotrema grandisporum

Myriotrema grandisporum is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae. Found in Eastern Thailand, it was formally described as a new species in 2002 by lichenologists Natsurang Homchantara and Brian J. Coppins. The type specimen was collected by the first author in Khao Yai National Park (Nakhon Ratchasima Province) at an elevation of 1,430 m (4,690 ft). It is only known to occur at the type locality.^[1]

Myriotrema grandisporum
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Graphidales
Family:	Graphidaceae
Genus:	Myriotrema
Species:	M. grandisporum
Binomial name
Myriotrema grandisporum Homchant. & Coppins (2002)

The lichen has a shiny, finely warted (verruculose) thallus with a poorly developed cortex and a white medulla. Its ascospores are thin-walled, somewhat translucent to brown, and spindle-shaped (fusiform), typically measuring 204.5–252.5 long by 17.5–25.5 μm wide. They have a transverse septum and contains from 45 to 49 locules (internal spaces). The lichen contains norstictic acid, a secondary compound that is rare in the genus Myriotrema.^[1]

References

1. Homchantara, N.; Coppins, B.J. (2002). "New species of the lichen family Theotremataceae in SE Asia". The Lichenologist. 34 (2): 113–140. doi:10.1006/lich.2002.0382. S2CID 85429979.