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On calcareous soil in ruderal site. Growing on damaged bryophytes.
After discussion with experts V. bryoctona seems to be the more plausible ID for this lichen. The differential was between V. bryoctona and V. xyloxena. Speaking for V. bryoctona is the green (wet) to pale (dry) thallus (V. xyloxena should have a pigmented thallus) and the spore size (my measurements fall in between the two species but in personal communications with a species expert V. xyloxena usually has spores <20 µm length).
One thing speaking against V. bryoctona is the lack of a gelatinous appendix on the spore . This however may be a problem of my staining technique.
Spores in water without perispore or gelatinous appendix.
Dimensions in water (min) q1-q9 (max); n=20
Length (µm): (18) 18,3-25 (25)
Width (µm): (9,9) 10,9-13 (13,1)
Ratio: (1,6) 1,6-2 (2)
Water/India ink. No evidence for a gelatinous appendage
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