ORIGINAL ARTICLE
Ascospore size declines with elevation in two tropical parmelioid lichens
1
386 rue des Flamboyants, F-40600 Biscarrosse, France
2
Evolution and Conservation Biology, InBios Research Center, Institut
de Botanique B22, Université de Liège, Chemin de la vallée 4, 4000
Liège, Belgium
Publication date: 2020-06-02
Plant and Fungal Systematics 2020; 65(1): 227-237
KEYWORDS
ABSTRACT
Spore size and shape are biometric parameters frequently used in lichen taxonomy,
especially in species characterization. However, the influence of environmental
factors on the intraspecific variability of these characters remains very little investigated
in lichenology. The elevational variation in spore length, width, volume and shape (length/
width ratio) of two species of the genus Hypotrachyna (H. aff. damaziana et H. altorum)
occurring on Réunion Island (Indian Ocean) were studied. Spore length, width and volume
significantly decrease with elevation in H. aff. damaziana, and spore width and volume also
significantly decrease with elevation in H. altorum. There is no relation between spore shape
and elevation in either of the two species. A significant correlation was further observed
between the intra-individual variability in spore size of H. aff. damaziana and elevation.
For this species, inter-individual variability in spore volume is also correlated with mean
annual temperature and mean annual precipitation of the sampling locations, and spore
width and length are correlated with mean annual temperature.
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