08-11-2025 00:29
Francois Guay
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Josep Torres
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Edvin Johannesen
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03-11-2025 21:34
Edvin Johannesen
These tiny (0.4-0.5 mm diam.), whitish, short-stip
Dwarf birch leaves
Nina Filippova,
14-07-2013 06:30
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)
Hans-Otto Baral,
14-07-2013 23:12
Re : Dwarf birch leaves
No clear idea, only I see affinities to L. virgineum. Did you measure the hair length? Probably not longer than 70 µm?
Nina Filippova,
17-07-2013 05:32
Re : Dwarf birch leaves
It seems the same species - C. juncinum; they are collected in the same plot, and the structure is similar. I had the first sketch from a dead specimen (on Betula nana), so have re-collected it now and there the description and photos in vital. Could it be possible, that the same species is growing on such different substrates?
Apothecia cupulate, stipitate, white, outer surface and edge hairy, up to 0.7 mm high, receptacle to 0.5 mm in diameter; white with yellowish hymenium, becoming darker on drying.
Hairs cylindrical, slightly broader at base, and segmented there, filled with small refractive vacuoles, 56–81 x 3–4.3; asci cylindrical, with crozier, euamyloid ring, 62–68 x 6–7.2; paraphyses narrow-lanceolate, filled with small refractive vacuoles, exceeding the asci, 75–100 x 3–4; spores fusoid, with several small oils, 15.6 (12.8–19) x 2.2 (1.9–2.5) (n=14).
Apothecia cupulate, stipitate, white, outer surface and edge hairy, up to 0.7 mm high, receptacle to 0.5 mm in diameter; white with yellowish hymenium, becoming darker on drying.
Hairs cylindrical, slightly broader at base, and segmented there, filled with small refractive vacuoles, 56–81 x 3–4.3; asci cylindrical, with crozier, euamyloid ring, 62–68 x 6–7.2; paraphyses narrow-lanceolate, filled with small refractive vacuoles, exceeding the asci, 75–100 x 3–4; spores fusoid, with several small oils, 15.6 (12.8–19) x 2.2 (1.9–2.5) (n=14).
Hans-Otto Baral,
17-07-2013 07:17
Re : Dwarf birch leaves
Now I am not really sure what you did:
This Lachnum is of course not the same as posted before, so the above left macro refers to L. cf. virgineum, while this I do not know. It is actually similar to L. juncinum which has a higher lipid content and slightly broader spores. Maybe close to L. tenuipilosum which, however, also grows on grasses.
Zotto
This Lachnum is of course not the same as posted before, so the above left macro refers to L. cf. virgineum, while this I do not know. It is actually similar to L. juncinum which has a higher lipid content and slightly broader spores. Maybe close to L. tenuipilosum which, however, also grows on grasses.
Zotto
Nina Filippova,
17-07-2013 07:42
Re : Dwarf birch leaves
Thanks, Zotto,
the first specimen form Betula nana (#4227) was in dead state and i will look for it more, to describe in vital. I made another collection (#4304) recently of another species (you said "maybe close to L. tenuipilosum") on the same substrate, but mixed up the photos and made the apothecial compillation from different specimens. Now i have corrected the photos in the previous post.
Nina.
the first specimen form Betula nana (#4227) was in dead state and i will look for it more, to describe in vital. I made another collection (#4304) recently of another species (you said "maybe close to L. tenuipilosum") on the same substrate, but mixed up the photos and made the apothecial compillation from different specimens. Now i have corrected the photos in the previous post.
Nina.
Hans-Otto Baral,
17-07-2013 07:49
Re : Dwarf birch leaves
On your photos of #4227 I see some living asci, paraphyses and hairs, these latter without VBs. Anyhow it would be good to find this in better state.
Zotto
Zotto