Mixtoconidium canariense on Ramalina lacera?

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JennyS
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Mixtoconidium canariense on Ramalina lacera?

Post by JennyS » Thu Sep 19, 2019 11:38 am

Lichenicolous on several Ramalina lacera thallii on a Horse Chestnut in Co. Limerick, Ireland. Conidia abundant, 1-septate 12.5-15 x 5 µm. Is this Mixtoconidium canariense?

From the lichenicolous draft keys:
"Conidia 1-septate, ellipsoid, often slightly constricted at the septum, 10-13 x 3.5-4(-4.5) um; intermixed with simple bacilliform microconidia 4-6.5 x 1 um; conidiomata 85-300 um diam, immersed in apothecium-like galls on thalli of Ramalina canariensis; Canary Islands (Gran Canaria), Spain (Mallorca). See Etayo (1995).
...................................................... Mixtoconidium canariense Etayo 1995
z Q Mixtoconidium canariense 1909 106 Ram lac.jpg
z Q Mixtoconidium canariense 1909 288 Ram lac.jpg
z Q Mixtoconidium canariense 190919 034 Ram lac.jpg
z Q Mixtoconidium canariense 190919 037 Ram.jpg
z Q Mixtoconidium canariense L1 1909-4 12-15x5.jpg
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Neil Sanderson
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Re: Mixtoconidium canariense on Ramalina lacera?

Post by Neil Sanderson » Mon Sep 23, 2019 9:33 am

Jenny

Looks like a good match other than the conidia sizes. Any sign the "intermixed with simple bacilliform microconidia" I can see some out of focus things that could be these? Given the conidia size disparity it would be best get it checked by someone more expert than me, given it would be new to Ireland.

The following is a more up to date account adding a description of the sexual stage and changing the name to Mixtoconidium insidens: https://ascomycete.org/Portals/0/Archiv ... 24-134.pdf. The paper also has contact details.

Neil
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JennyS
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Re: Mixtoconidium canariense on Ramalina lacera?

Post by JennyS » Mon Sep 23, 2019 8:28 pm

Many thanks for the reply Neil.

Those conidia were examined under the microscope in a drop of K so I've just done another in water but similar measurements - 11-15 x 3.5-5 um most c12.5 x 5um, microconidia present 5-6 x 1.

The conidiomata size in the linked paper is much larger than that given in the draft description - 0.2–0.5 mm (200-500 um) diam rather than 85-300 um diam.
I measured the conidiomata on the specimen in the 3rd photo and the size of the smaller were 0.2–0.5mm diam with the large one 2mm. The conidiomata stained K+ red when the sections were cut - photo below

Specimens retained
z Mixtoconidium L4 190919 035 K+red.jpg
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Neil Sanderson
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Re: Mixtoconidium canariense on Ramalina lacera?

Post by Neil Sanderson » Mon Sep 23, 2019 10:02 pm

Jenny

The 0.2–0.5 mm diameter in that paper refers to the newly discovered apothecia, they refer to the original paper from the conidiomata size, so that is fine.

This certainly looks very like it is Mixtoconidium insidens (formerly Mixtoconidium canariense), which is very good record, Van Der Boom & Etayo (2017) consider it a rare species. Best to email the authors of Boom & Etayo (2017) and see what they think.

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Re: Mixtoconidium canariense on Ramalina lacera?

Post by JennyS » Tue Sep 24, 2019 7:57 pm

Just heard back from Javier Etayo - "yes, no doubt, it is Mixtoconidium insidens, really a good finding".

I've a couple specimens so I'd like to send one to Kew (who should I contact?) and one to Howard Fox at the Botanic Gardens, Dublin
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Re: Mixtoconidium canariense on Ramalina lacera?

Post by Neil Sanderson » Tue Sep 24, 2019 10:08 pm

Jenny

Great news, for Kew you could ask Paul Cannon

Neil
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