(21.06.2013)

Leaves of Dwarf birch (Betula nana) are populated by only three fungal species, but its branches were not searched yet and the list from the whole plant should be more diverse. At the leaves, one species dominates and probably this explains the short number of the others. I think that a number of discomycetes will still appear in late summer.

The dominated species, Gnomoniella nana, was seen at almost every leaf, growing scattered at both surfaces. Its spherical submerged perithecia with long protruding necks are easily recognised. (#4226 - https://www.cubby.com/pl/%234226/_e62f66a2b6444b6abbc0f5b6b48f2b2f)

Hairy superficial perithecia of next species was met several times. They remind one already described species at the leaves of Leatherleaf. But the spores in this from birch are significantly narrower. Probably, two different species or some variation of one, we will find it later. (#4225 - https://www.cubby.com/pl/%234225/_c413799e1e1b46689e8ace79b53f16d9)

A Lachnum species collected several times, and i expect to find them more later. Fallen leaves are typical substrate of this genus. The species has pure white stipitate apothecia, lanceolate paraphyses, asci with clamp, long fusoid spores, and cylindrical without enlargement hairs. (#4227 - https://www.cubby.com/pl/%234227/_1536b7111dd1471a81640746e2ba36f5)