LEJEUNIA - Lichens of Belgium, Luxembourg and northern France

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This species was recently described as an aggressive parasite on the
squamules of the primary thallus of Cladonia digitata (HAFELLNER, 1999).
Our specimen grows on a different host, C. subulata, mainly apically on the
podetia, and does not visibly damage the host.
A short description follows: ascomata blackish, 50-125 μm in diam.;
exciple thin and pale; hymenium and hypothecium pale; epihymenium pale,
but darkened through the presence of a brown parasitic hyphomycete; pigment
K- or more olivaceous or greyish; hymenium K/I+ pale blue, reaction week,
possibly due to the age of the specimen; paraphyses short-celled, branched,
irregular, almost contorted, 2.5-4.5 μm thick, apically not swollen nor
pigmented; asci at least 5-spored, elongate ellipsoid, 21-29 × 8.5-12 μm;
ascospores hyaline, becoming pale brownish when overmature, 1-septate,
constricted at septum, 10.3-12.5 × 4-4.5 μm.
Morphologically, our specimen is very similar to the published description of
A. digitatae. An alternative could be Lecidea epicladonia Nyl., a poorly known
species possibly belonging to Arthonia (ALSTRUP & HAWKSWORTH, 1990). For the
moment, we prefer to call our specimen A. digitatae, but we are aware that the
discovery of more specimens of Arthonia on different Cladonia species, and a
subsequent revision of that material, might lead to a different conclusion.
Bacidia neosquamulosa Aptroot & van Herk
Belgium, Fl.: Wilrijk, Kerkhof Steytelinck (C4.36), on Populus, 12.2002, D. Van
den Broek (hb Diederich). – Ard.: W of Gedinne, along étang de Boiron (K5.17), on
branches of Picea, 5.2000, P. van den Boom 24359 (h); Nassogne, near water-tower
(J6.27), square with Fraxinus, 5. 2001, P. van den Boom 26448 (h).
This species was known from a single locality in B Fl. (DIEDERICH &
SÉRUSIAUX, 2000: 177) and was also reported from L Lorr. (APTROOT et al.,
2001b). It might be rather common and widespread in the area of study, as
suggested by the additional collections from B Fl. and Ard.
Bagliettoa parmigerella (Zahlbr.) Vězda & Poelt
Belgium, Mosan: Huy, éperon rocheux à l’entrée du vallon du ruisseau de Solières (SE
de Bas-Oha) (G6.14), rocher calcaire compact ombragé en sous-bois, 3.2002, D. Ertz
650 (LG).
Luxembourg, Lorr.: Lasauvage, rocher de tuf calcaire dans le village (M7.48), 9.1999,
P. Diederich 13886 (h).
New for the study area.
Bryoria capillaris (Ach.) Brodo & D. Hawksw.
Belgium, Ard.: ‘sur les arbres dans le bois de Sourbrodt’ (G8.25), before 1830, M.
A. Libert s. n. (BR, with B. fuscescens); Reinartzhof (F9.35), sur Quercus en futaie,