A Monograph of the Norwegian Physciaceae

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No. 8. MONOGRAPH OF THE NORWEGIAN PHYSCIACEAE. 37 Physcia leptalea var. Tenella (p. P. ) HARMAND Lich. France (1909) p. 621.
Physcia ascendens BITTER Ueber die Variabilitat einiger Laubflechten etc. (1901) p. 431 et 433 fig. 3 AB BOULY de LESDAINS Recherches sur les Lichens des Environs de Dunkerque (1910) p. 107 (sensu latiore).
The synonymy of Physcia ascendens and Ph. Tenella is very intricate and has been still more complicated on account of the divergent opinion of the lichenologists as to
... their specific difference. It is therefore im- possible to give a full list of synonyms without a study of the various authors' material. They were first separated as two species by BITTER (1. C. ), but many eminent lichenologists (e. G. HARMAND) consider them to be merely individual variations produced by different degrees of humidity and temperature.
1 have carefully studied the question in nature and on a large her- barium material, with the result that I agree with BITTER. The two spe- cies frequently grow together on the same tree, they are even entangled, the laciniae of one of them making their way between the laciniae of the other species.


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