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08-04-2021 21:17

Rutstroemia sp. possibly.
Pauline. Penna

Hello EveryonePlease could you help me with this s

10-04-2021 09:24

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Rutstroemia sp. possibly.
Pauline. Penna, 08-04-2021 21:17
Hello Everyone
Please could you help me with this small asco found on bare soil with bryophytes and plant remains.
Light brown apothecia with darker rim and paler short stipe 0.3-0.4 mm diameter, 0.5 high. Excipulum textura globulosa at the base, textura prismatica at the rim, cells brown 25-30 x 7 microns at the rim.
Asci cylindrical with flat apex, J-ve, 160 x 10microns, croziers not seen. Cuboidal crystals amongst the asci.
8 spored uniseriate, spores elliptical to fusiform with blunt ends, hyaline, cyanophilous, small guttules clustered at each pole. Some spores septate. 16-19 x 5-6.6 microns.
Paraphyses septate and branching, cylindrical, 132 x 5 microns.

I have struggled to get to Genus, maybe Graddonia, Mollisia, finally after asking for help and being directed to Zotto's Rutstroemia fulva notes I think it could be around this area.
Help please.
Pauline
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Michel Hairaud, 08-04-2021 22:06
Michel Hairaud
Re : Rutstroemia sp. possibly.

Bonsoir Pauline,


Rutstroemia is a good choice.


I would have thought of R. calopus but this species should be with croziers.


2 other taxons are close  R. maritima and R paludosa.


Note that Zotto has transferred the former Rutstroemia species into the genus Clarireedia.


I wonder whether the combinations in Clarideedia have been published ?


Amitiés. Michel

Hans-Otto Baral, 08-04-2021 22:28
Hans-Otto Baral
Re : Rutstroemia sp. possibly.
Hi Pauline,

crystals actually do not occur in R. fulva and the spores are rather full of oil (multiguttulate).

I guess this is Rutstroemia calopus or paludosa. Needs to look at the ascus base, with or without croziers?

It was not me who transferred the graminicolous species to Clarireedia, that was an American or British author, but the genus is not valildy published and I am not a friend of such splitting.

Zotto
Pauline. Penna, 09-04-2021 20:44
Re : Rutstroemia sp. possibly.
Bonsoir Michel

Thank you for pointing me to these species . I have today looked more closely at Zottos amazing notes and photographs. I have some questions still.

best wishes

Pauline
Pauline. Penna, 09-04-2021 20:55
Re : Rutstroemia sp. possibly.
Hello Zotto

Your website is truly a wonder! I have looked closely at the species suggested and also examined my last remaining specimen, now in poor condition.

I think I can see a crozier but the asci are all so compressed at the base it is not easy.

I feel it most closely matches R.maritima, blunt apex of the asci, IKI-, spore oil droplets at either end, crystals amongst the asci and I too found spores in the ascus with a clear sheath around them.
However it was growing on soil with grasses and mosses, no Ammophila present, though it was on the coast. Are Rutstroemias host specific?

Many thanks
Pauline
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Hans-Otto Baral, 09-04-2021 21:46
Hans-Otto Baral
Re : Rutstroemia sp. possibly.
I must tell you this Cralireedia relationship is a mess of difficult taxa. R. maritima is unclear to me how it could be defined. probably not restricted to Ammophila because a collection on Iris falls to it.

R. calopus and R. paludosa grow on Poaceae and Cyperaceae, respectively. They can be distinguished by croziers +/-. But among the newly described species are synonyms. Oh i forgot, Clarireedia was validly published in 2018, and the type of C. bennetii is = R. calopus.
Michel Hairaud, 09-04-2021 22:29
Michel Hairaud
Re : Rutstroemia sp. possibly.

Thanks Zotto for the taxonomic evolution detail .


Michel

Pauline. Penna, 10-04-2021 11:25
Re : Rutstroemia sp. possibly.
Thank you Michel and Zotto for your assistance, much appreciated. I will track down the Clarireedia article to read.

Best wishes
Pauline