disco on Abies cone - Forum ASCOFrance

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disco on Abies cone

Malcolm Storey, 11-07-2018 13:11

Another disco from years ago. This one on Abies cone scales.

http://www.bioimages.org.uk/html/r162856.htm

Ascospores: cylindric-clavate, 32/3µm, multi-vacuolate and 1-septate.

Paraphyses: filiform, branched, 2µm diam, tips weakly agglutinated.

Ascus tips not staining in Melzer's Iodine.

Excipulum: soft, black, covering hymenium when young.

Many thanks for any comments.

Hans-Otto Baral, 11-07-2018 13:17

Re : disco on Abies cone

Looks rhytismatalean to me.

Malcolm Storey, 11-07-2018 15:36

Re : disco on Abies cone

Many thanks again Hans-Otto.

Malcolm Storey, 27-03-2019 14:03

Re : disco on Abies cone

This has been identified as Colpoma crispum. It's more usually found on dead branches of the same host.

Hans-Otto Baral, 27-03-2019 16:18

Re : disco on Abies cone

Dear Malcolm

thanks for this result. It is possible, though I think the spores are with 3 µm a bit wide when comparing available data.

Zotto

Malcolm Storey, 27-03-2019 17:53

Re : disco on Abies cone

It was identified by Paul Cannon at Kew. He had the material but I don't know if he measured the spores himself. Some of my measurements have been a bit wider than they should be - perhaps caused by the mounting medium. (I know it's always best to use water!!)

Hans-Otto Baral, 27-03-2019 18:38

Re : disco on Abies cone

In water the spores would be wider, but it could be that pressure made the spores wider.

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