Pertusaria jurana Erichsen (1935

Oset, Magdalena, 2021, On the identity of some taxa of Pertusaria (lichens) described by C. F. E. Erichsen, Phytotaxa 497 (2), pp. 165-171 : 167-168

Pertusaria jurana Erichsen (1935 [ 1936]: 677)

Type:—[Switzerland] SCHWEIZ, Jura, Neuenburg, Val Travers, Buttes am Sorbus einer Allé , 850m., 03.10.1928, leg. E. Frey 1294 (lectotype HBG —designated here, Mycobank MB 10000525 ). Figure 2 .

The type is characterized by whitish thallus with semiglobose, in part sorediate, scattered or crowded warts. The thallus is zoned at the margin. Soralia with granular soredia are very frequent, whitish to greenish grey ( Figure 2 ). The analysis of secondary metabolites ( TLC) showed the presence of fatty acids. Pertusaria jurana was described from Switzerland and the name has later been reported from Europe only ( Erichsen 1935 [ 1936]; Hocevar et al. 1995; Fałtynowicz 2003; Clerc 2004; Knežević & Mayrhofer 2009).

It is chemically and morphologically concordant with the present circumscription of Lepra albescens ( Hudson 1762: 445) Hafellner (in Hafellner & Türk, 2016: 171) ( Chambers et al. 2009) and is thus considered synonymous here.

In the protologue Erichsen cited four specimens of Pertusaria jurana , but did not determine any specimen as a holotype. Three of them are deposited in HBG. One sheet collected from Schwiez is annotated as ‘Typus’ with handwritten notes of Erichsen and in this case it should be designated as lectotype ( Turland et al. 2018). The type of Pertusaria jurana consists of two pieces of bark with the same thallus. Morphological characters of both correspond to the description in the protolouge.

Lepra albescens can be mistaken for the chemically and, when young, also morphologically similar L. ophthalmiza ( Nylander 1861: 180) Hafellner (in Hafellner & Türk, 2016: 173). Both species produce fatty acids, but they predominantly differ in the thallus characters: L. albescens produces true soralia with granular soredia, whereas the sorediate warts of L. ophthalmiza contain apothecia ( Oset & Kukwa 2010 and literature cited therein).

Another similar species is Pertusaria krogiae Archer et al. (2009: 316) from Africa ( Archer et al. 2009). The species is characterized by a grey thallus with numerous grey-whitish, raised to subtuberculate soralia; and the presence of lichesterinic, protolichesterinic and allo-protolichesterinic acids and sometimes atranorin. All species listed above are corticolous ( Hanko 1983; Archer et al. 2009).

Syntypes of P. jurana examined. Montenegro, Lověen , an Rinden, 1929, leg. M . Servít ( HBG). [ Poland], Ostpreussen , Masuren , Angerburg , an Wegeschen nach dem Heldenfriedhof hin 20.09.1931, leg. C . F .E. Erichsen ( HBG) .

Figures

FIGURE 2. Lectotype of Pertusaria jurana in HBG.