Diagnose : • Description: see in the original protologue ibid, pictures 8A8B vs 9A9B in photo board: 42, and key in
Appendix 1 > dichotomie 37 in this document. If F. austrovogesiaca and F. csikhegyensis are two taxa which have
the same ploidy in common, they are tetraploid (4x), F. austrovogesiaca (pictures 8A8B and photo 14, board 3B in
Appendix 2 in this document) differ from the populations of F. csykhegyensis (pictures 9A9B),) of central Europe
by the following morphoanatomical, genetic, chorological, synecological and symphytosociological characters:
– F. austrovogesiaca (F. a.) has leaf blades with an elliptical to obovaloelliptical crosssection with (7) 911
(13, 14) veins spikelet ≥ 7,3 mm [(6.8) 7.7 ± 0,4 (9)] long, lemma ≥ 4,7 mm [(4.2) 5 ± 0,3 (6.2)] de long vs leaf
blades with an obovate or open Vshape crosssection 79 (11) veins, spikelet (5.7) 6.58.3 (9.1) mm long, lemma
(3.7) 4.15.8 (6.1) mm long for F. csikhegyensis (F. c.),
– sclerenchyma is in continuous ring, uninterrupted on the flanks for F. a. vs scerenchyma ring partly
interrupted on some flanks of leaf blades for F.c,
– net thinning of sclerenchyma on the margins which is reduced to a single layer of cells on a few mm fot F. a.
vs sclerenchyma not significantly thinned at the margins for F. c.,
– at the genetic level, the RADseq (Graph. 1) shows that the two taxa (Fcso8 vs Fcs06) in their locus classicus
are opposite and that the plastomes (Graph. 2) are distributed into two different chloroplast groups: ser. Festuca for
F. austrovogesiaca (Fcs06) vs ser. Psammophilae Pauwlus for F. csikheyensis (Fcs01Fcs02),
– F. austrovogesiaca is an orophyte [(500) 8001 100 m] from the Southern thermoacidophilic Vosges and a
chomochasmophytic taxon. It only occupies escarpments, outcrops and promontories of granitic rock, in a
subatlantic tone, where it forms primary to subprimary grasslands, while F. csikhegyensis is a taxon of the plains
and hills in a continental climate, which grows mainly on rocky sites on calcareous bedrock/substrate (see Appendix
2, photo 14)
Références :
Boeuf et al. (2022)
Holotype : • Holotypus deposited at the Basel University Herbarium n° BASBG00307246 (see Appendix 2, Fig. 3)
[France, HautRhin (68), Oberbruck, Lieudit Neuweiherwald, granite rocky escarpments above the Grand
Neuweiher Lake (HautesVosges, 890 m), leg. R. Boeuf, B. Lamard et J.P. Berchtold (june 11, 2019), det. R. Boeuf
et J.P. Berchtold].
• Isotypus: 1/2 Universisty of ClermondFerrand n° CLF121185 ; 2/2 MNHN n° P009337008 (same
indications).
Références :
Boeuf et al. (2022)
