Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 151 



Var. polychroa (Th. Fr.) Vain. Biatora polychroa Th. Fr. 1. c. 

 Bacidia fuscorabella a. polychroa Th. Fr. Lich. Scand. II (1874) p. 346. 

 Secoliga fuscorabella f. umbratilis Stizenb. 1. c. (1863) p. 57; Bacidia 

 Rabenh. Lich. Eur. XXVII (1865) n. 728. 



Exs. Zwackh Lich. Exs. (1854) n. 233 p. p. — Rabenh. Lich. Eur. 

 XVII (1859) n. 481, XXVII (1865) n. 728, XXXV (1874) n. 936. — Arn. 

 Lich. Exs. (1877) n. 712 a, b, Lich. Monac. Exs. (1888) n. 50, (1895) n. 

 409 a, b. 



Thallus modice incrassatus, cinereo-glaucescens aut cinerascens. 

 Apothecia majuscula aut mediocria, versicoloria, rufescentiaauttestaceo- 

 rufescentia aut subfusca. 



Distr. AL: Ramsholm (E. Nylander, F. Elfving). Ad cor- 

 ticem fraxini rara (atypica et thallo sordide aibicante v. acerinae 

 similis). 



Variationes hujus speciei parum constantes sunt, saepe in eodem 

 specimine transeuntes. — Apothecia vulgo crebra, sessilia, adpressa, 

 basi bene constricta, lat. l.s — O.s mm, crass, circ. 0.44o — O.seo mm, niargine 

 disco subconcolore, raro pruinoso [in v. Guthnickii (Hepp) Stizenb. et 

 f. iimbratili Stizenb.]. Perithecium pallidum aut in margine apothecii 

 vulgo intus rubricoso-pallidum rufescensve, chondroideum, ex hyphis 

 formatum radiantibus, pachydermaticis, conglutinatis, cavitatibus cellu- 

 . larum maxima parte oblongis, O.002 — O.0005 mm latis, in parte exteriore 

 ellipsoideis et O.002— O.ooe mm latis. Hypothecium superne rufescenti- 

 vel subfuscescenti- aut pallido-rubricosum, inferne pallidum aut deco- 

 loratum, chondroideum, pachydermaticum, cavitatibus cellularum an- 

 gustis, hyphis irregulariter contextis. Hymenium O.120— O.070 mm eras- 

 sum, totum pallidum decoloratumve aut epithecio dilute rufescente, 

 jodo intense caerulescens. Partes intensius coloratae apothecii KHO 

 purpurascentes vel subviolascentes. Paraphyses sat laxe cohaerentes, 

 crass. 0.0015 mm, apice baud incrassatae, increbre septatae. Sporae 

 8:nae, polystichae, aciculares, basin versus attenuatae, apice superiore 

 vulgo obtuse, rectae aut rectiusculae, septis transversis circ. 3—14, 

 long. circ. O.o7o-0.o6o(—0.o35), crass. O.004—O.003 (—O.025) mm. „Stylosporae 

 luteolae, long. O.009, crass. O.003 mm" (Arn. Lich. Exs. n. 712 b). Gonidia 

 pleurococcoidea, globosa, diam. O.ou— O.oo? mm, vulgo simplicia, parce 

 bicellulosa aut glomerulosa observata, membrana saepe leviter in- 

 crassata. Hypothallus indistinctus. 



Obs. Verrucaria fuscorubella Hoffm. secundum specimen authent. 

 € Germania in herb. Ach. ad v. polychroam (Th. Fr.) pertinet, thallo 

 olivaceo-cinereo, modice incrassato, apotheciis versicoloribus, hymenio 

 0.080—0.070 mm crasso, pallido, partibus lateralibus KHO leviter viola- 

 scente, hypothecio parte superiore sordide rubricoso-pallido, KHO 

 violascente (in apothecio sanguineo-rubescente hypothecium dilute 



