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Brick-red Mellitiosporiella
Edvin Johannesen, 13-09-2018 13:04
Edvin JohannesenI have collected a "propolioid" specimen on large fallen trunk of Picea abies in old, mature forest in southern Norway. I find this apparently identical to what is shown in you key to Marthamycetaceae (dated Jan. 2015), Hans Otto, at point 8 in the Mellitiosporiella key (as Mellitiosporiella sp., Leg. Popov from Caucasus, on Carpinus).  The discs are brick red (only one of the photos show the real, brick red colour, the remaining appear a bit too brown). Spores are in the same size range as indicated in the key, and appear consistently 3-septate (see photo of single spore in KOH). The paraphyses are frequently branched at the tip (photos).  I do not see blue staining at ascus tips with Meltzer. It appears that the spores have several lipid bodies, but I have not given that a thorough study. Do you agree that this seems to be the same species? Has the taxon been formally described yet?  Grateful for any help.
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Hans-Otto Baral, 13-09-2018 14:27
Hans-Otto Baral
Re : Brick-red Mellitiosporiella
Hi Edvin
this is great! I only know of Eugene's collection, but yours seems to fit, except that the host wassaid to be Carpinus.
It would be good if you could supply some spore measurements. The scale is 1:1?
The LBs in the spores appear to fit well: some small ones but not a high lipid content.
Melzer is unsuitable for ascomycetes. But in Lugol you will also have a negative reaction, in contrast to many Ostropales with are IKI+ but MLZ-.
Did this grow in Scandinavia?
Zotto
Edvin Johannesen, 13-09-2018 18:13
Edvin Johannesen
Re : Brick-red Mellitiosporiella
Thanks! I will do some spore measurements (yes, the scale is 1:1) and provide at this forum. I did have Lugol, but somebody took it at a foray. I guess I have to get some more. Like I wrote, this was found in Scandinavia (Oslo area). Very excited about this :) Has the species been formally described or are these the only two collections known?
Hans-Otto Baral, 13-09-2018 21:27
Hans-Otto Baral
Re : Brick-red Mellitiosporiella
Sorry, I overlooked the location remark.

As I said, only two collections, yes. I am unaware of a literature report that fits the species.

Zotto
Edvin Johannesen, 14-09-2018 13:25
Edvin Johannesen
Re : Brick-red Mellitiosporiella
Here are some spore measures (in KOH, 1000x oil). It is done "free-hand", since I do not have USB-ocular with measuring SW, so not utterly accurate, but close:

3-septate spores:

11x3

14x3.5

14x3.5

11x3

11x4

14x3

10x3

10x4

10x4

13.5x3.5

11x4

11x3.5

2-septate spores:

12x3.5

13.5x3.5

1-septate spores:

10x3

10x3

Aseptate spores:

8.5x2.5

12x3

9x2

Hope this is useful.
Hans-Otto Baral, 14-09-2018 15:22
Hans-Otto Baral
Re : Brick-red Mellitiosporiella
Thanks, I will combine them to

1-3-septate 10-14 x 3-4, which is of course in good agreement with Eugene Popov.

The non-septate spores are immature and therefore smaller. I assume asci of this genus eject only septate spores.

I never measured with any electronical device so far, except for from photos with a scale.

So these are in KOH. When was your sample collected? It could easily be that the spores are still alive and when mounted in water they would be larger. For instance, I measured in M. pulchella HB 5511b 

alive 11-17 x 3.8-4.7
dead (in KOH) 9.5-15 x 3.5-4.5


Edvin Johannesen, 15-09-2018 08:59
Edvin Johannesen
Re : Brick-red Mellitiosporiella
It was collected last Saturday.  Thanks for the information about differences in spore size in KOH and water, respectively.  I did know there was an effect, but not which way and the extent.