''Leptogium sphaerosporum'' is a species of corticolous (bark-dwelling), foliose lichen in the family

Collemataceae The Collemataceae are a lichenized family of fungi in the order Peltigerales. The family contains ten genera and about 325 species. The family has a widespread distribution. Taxonomy The family was circumscribed by Jonathan Carl Zenker in 1827; ...

. Found in Nepal, it was formally described as a new species in 2010 by Per Magnus Jørgensen and Louise Olley. The type specimen was collected on the track from Thulo Syabru to Bamboo ( Langtang) at an elevation of . Here, in a shady and humid mixed broad-leaved forest, it was found growing on the bark of '' Alnus nepalensis''. It has a bluish-grey, foliose thallus measuring up to wide comprising smooth lobes up to broad. The apothecia are up to in diameter with a flat brown disc and a thallus margin that is pale blue. The ascospores are spheroid, muriform (divided into chambers) with rounded tips and have dimensions of 19–27 by 14–19

μm The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ...

. ''Leptogium sphaerosporum'' is similar to '' Leptogium pedicellatum'', but the latter species is distinguished by its ellipsoid (not spheroid) ascospores that measure 25–30 by 10–15 μm.

References

sphaerosporum Lichen species Lichens of Asia Lichens described in 2010 Taxa named by Per Magnus Jørgensen {{Peltigerales-stub