Dichotomous key to European Rosellinia
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Subgeneric classification and ascospores dimensions follow Petrini (1993),
and Laessøe & Spooner (1994) for R. evansii. Owing to variations
reported in subiculum persistence in R. glabra and ambiguous
features in R. helvetica,
they both appear in two different sections of the key.
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Key to subgenera and related taxa |
1- Subiculum absent from the earlier stages onwards |
2
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1-
Subiculum
present around perithecia, at least at young stages |
4
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2- Stromata erumpent, with bark rupturing in a stellate pattern, ascospores 22-28 x 8.5-10 µm with a spiralling germ slit |
R. evansii
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2- Stromata superficial |
3
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3-
Stromatal surface with conspicuous cracks, ascospores 19-26 x 6-8.5 µm with short sigmoid germ slit; on dicotylodenous hosts |
R. callosa |
3- Stromatal surface smooth, ascospores 15-22 x 5.5-9 µm, with a straight germ slit spore-length; bambusicolous |
R. amblystoma |
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4- Subiculum non-persistent, absent around mature stromata |
subg. Calomastia |
4- Subiculum persistent, at least at the base of mature stromata |
3 |
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5- Ectostroma thin (< 25 µm thick), brittle, folded at the base when dry |
subg. Corrugata |
5- Ectostroma thicker, hard, smooth to rugulose |
subg. Rosellinia |
Key to species of subgenus Calomastia |
1- Ascospores with germ slit sigmoid and much shorter than spore length |
R. franciscae |
1- Ascospores with germ slit straight on only slightly sigmoid, spore-length |
2 |
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2- Ascospores lemon-shaped |
R. medullaris |
2- Ascospores ellipsoid to ellipsoid-inequilateral |
3 |
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3- Ascospores with a slimy sheath on the flattened side and at both ends, cellular appendages absent |
4 |
3- Ascospores with slimy caps only at both ends, cellular appendages present or not |
6 |
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4- Stromata with conical top; subiculum somewhat persistent, ascospores 19.5-23.5 x 7-9 µm |
R. helvetica |
4- Stromata flat-topped; subiculum non-persistent |
5 |
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5- Ascospores 16-21 x 6-8 µm, ascal apical apparatus up to 5 µm high |
R. mammaeformis |
5- Ascospores 20.5-26.5 x 6-9 µ, ascal apical apparatus up to 8 µm high |
R. britannica |
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6- Ascospores with cellular appendages at both ends |
7 |
6- Ascospores lacking cellular appendages |
8 |
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7- Ascospores brown to dark brown, 14-18 x 5.5-7.5 µm |
R. glabra |
7- Ascospores light brown, 19.5-29.5 x 5.5-8.5 µm |
R. subsimilis |
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8- Ascospores 14-16.5 x 5.5-7.5 µm |
R. etrusca |
8- Ascospores longer |
9 |
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9- Ascospores narrowly ellipsoid in front view, 17-27 x 5-7 µm |
R. nectrioides |
9- Ascospores broadly ellipsoid in front view, 16.5-24.5 x 5.5-8.5 µm |
R. abscondita |
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