Tarzetta betulicola? - Forum ASCOFrance

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Anamorf on decaying leaves of Euonymus japonicus 'Microphyllus'

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Anamorf on decaying leaves of Euonymus japonicus 'Microphyllus'

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Tarzetta betulicola?

Stefan Jakobsson, 13-06-2020 21:22

Here a Tarzetta #1 growing with Betula and some Syringa, Spiraea, Ribes and 10 m away also some modest Picea, on soil at the verge of a garden. The width is maximum 21 mm and at the base with a stipe, thin and only one or two mm visible before being covered with soil. 8-spored, no croziers. The paraphyses are cylindrical, not enlarged at apex and rarely with some nobs or somewhat enlarged at septa, regularly branched but not close to the apex. The spores are

(18.3) 18.9 - 21.2 (21.9) × (10.1) 10.7 - 11.6 (12.0) µm
Q = (1.6) 1.7 - 1.9 (2.0) ; N = 32
Me = 20.1 × 11.1 µm ; Qe = 1.8.

Could this be T. betulicola ad int.? Southern Finland.

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A week ago this had only a few mature spores but then they were of a more fusoid shape than today.

Stefan Jakobsson, 13-06-2020 21:24

Re : Tarzetta betulicola?

This one #2 was growing alone some five meters away from the previous ones. It is very similar to #1 but somewhat bigger, 31 mm diam., a little bit lighter in colour and the spores are slightly bigger:

(19.4) 20.2 - 22.4 (22.7) × (11.3) 11.6 - 12.95 (13.0) µm
Q = (1.5) 1.7 - 1.86 (1.9) ; N = 34
Me = 21.4 × 12.2 µm ; Qe = 1.8

I did not observe any knobs on the paraphyses. Probably the same as #1?

Nicolas VAN VOOREN, 20-06-2020 19:42

Re : Tarzetta betulicola?

Dear Stefan,
T. betulicola is a provisional name, just a hypothesis within the T. catinus/pseudocatinus complex. Your data may correspond to this "species" based on the ecology, spore shape and size. A DNA analysis is required to confirm.

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