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09-05-2019 23:24

Viktorie Halasu Viktorie Halasu

Hello, this Orbilia was growing on a laying branc

10-05-2019 08:54

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Orbilia sect. Aurantiorubrae?
Viktorie Halasu, 09-05-2019 23:24
Viktorie HalasuHello,

this Orbilia was growing on a laying branch (Populus??) in lowland deciduous forest (Fraxinus, Padus, Populus), it looked more red than on the photo, size about 1 mm. 
Paraphyses capitate, covered with an exudate. Asci 8spored, part of spores turned opposite way. Exudate on surface cells of the margin. 
Sp. curved (sigmoid?), elongated SB and 1-2 small LBs, * (10,4) 11-13,1 (13,9) × (0,9) 1,1-1,4 (1,5) um, avg = 12 × 1,2 um, Q = 8,2-8,9-10.


Could it be something from the Aurantiorubrae section? I'm not sure what's the difference between aurantiorubra and jugulospora. 


Thank you very much in advance.
Viktorie

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Hans-Otto Baral, 10-05-2019 08:00
Hans-Otto Baral
Re : Orbilia sect. Aurantiorubrae?
Dear Victorie
indeed this is O. aurantiorubra. O. jugulospora is very close, and it is mainly genetical and geographical that this species was separated. Here is the key:

4. Spores strongly helicoid (basally hooked), *(9.5–)10.5–12(–13) × 1–1.4 µm; SBs mainly 0.4–0.6 µm wide; conidia *2.5–3.5 µm wide, 3(–4)-septate; angiosperm bark, temperate to subtropical ± humid northeastern Africa and eastern Asia ...... O. jugulospora
4. Spores medium helicoid, *9–12.5 up to 12–15(–17) × 1.1–1.6 µm wide; SBs mainly 0.7–1 µm wide; conidia mainly *4–5 µm wide, 4–6-septate; bark (rarely wood) of mainly Salix, Ulmus and Fabaceae, ± temperate (rarely subtropical) humid Europe, Macaronesia, western Asia, North America ........ O. aurantiorubra

The spores are partly inverted as in most Orbilia species, but it is better to figure them with the SB upwards. In fact when I sampled this species the first time in 1974 and 1977 I also depicted the spores inversely.

The substrate was usually Salix and Ulmus, also Fabaceae, once Fraxinus and never Populus (but which would make sense considering it is a Salicaceae). Would you be able to look at the wood anatomy?

I know only one record from Czechia and one from Slovakia so far.

Zotto

Viktorie Halasu, 10-05-2019 08:29
Viktorie Halasu
Re : Orbilia sect. Aurantiorubrae?
Dear Zotto, 

thank you very much. Unfortunately I have just a piece of bark from that branch, but I still remember where exactly it was so I'll try to relocate it when I go there the next time. It seemed more silver (like poplar) than yellow like ash, but of course better to check the wood. 

I took the spore orientation from the uppermost spore in asci which seemed with SB down.

Olomouc-Cernovir, ca. 220 m a.s.l., ca. 3-4 cm thick branch laying on the ground, 49°37,203' 17°16,277', leg. 10. III. 2019, herb. number will be V.H. 1044 after drying. It was immature in march and then I forgot that it's still in the fridge and microscoped it just yesterday. Good thing that Orbilias are such survivors. 

VIktorie
Hans-Otto Baral, 10-05-2019 09:04
Hans-Otto Baral
Re : Orbilia sect. Aurantiorubrae?
In O. aurantiorubra the lower spores are inverted as in the majority of species. On your pic I assume that some of the upper spores got pressed out of the ascus.

You can try a photo of the inner surface of the bark, but it is not easy to identify the genus with that.