Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 199 



Thallus macula dilutissime obscurata indicatus, partim di- 

 stinctius, hyphis fuscescentibus e basi perithecii excrescentibus 

 numerosis. Apothecia numerosa, sat crebra, lat. O.25 — 0.2 ( — 0.3) 

 mm. Asci ventricosi, long. O.045 — 0.065, crass. O.016 — O.020 mm. 

 Paraphyses obsoletae. Sporae ovoideo-oblongae, 3-septatae, long, 

 vulgo O.015 — O.018, rarius O.013 — O.021, crass. O.005 — O.007 mm. 

 Gonidia desunt. Conf. etiam sub Didymella pyrenastrella. — 

 Forsan est autonoma species. 



Obs. „Mycoporum elachistoterum" in Norrl. et Nyl. Herb. Lich. 

 Fenn. V (1882) n. 236 b (Cyrtidula macrotheca Minks Lich. Cyrtid., 1891, 

 p. 10, p. p.), ad ramos Sorbi in Korpilahti Tavastiae lectum (Norrl.), v. 

 submaculanti proximum, sporis instructum est O.012 — O.ou mm longis, O.004 

 mm crassis, 3-septatis, subfusiformi-ovoideo-oblongis, apicibus obtusis 

 aut altero apice rotundato, paraphysibus haud evolutis, peritheciis latere 

 epidermide corticis velatis, O.110 — O.160 mm latis, sat crebris, simplicibus 

 aut confluentibus, cellulis globosis aut irregularibus, O.003 mm latis, 

 ostiolo rotundato, mediano, lat. O.010 — O.025 mm, hyphis fuscis e basi 

 excrescentibus numerosis, crebre constricte articulatis, cellulis globosis, 

 O.006 — O.004 mm latis, ascis ovoideo-ventricosis, long. O.030 — O.054, crass. 

 O.014 — O018 mm, polystichis, in apice membrana modice incrassata, 

 conidiis bacilliformibus, rectis, long. O.C03, crass. O.0005 mm. Specimina 

 secundum Minks (1. c.) in Germania lecta, sporis fuscescentibus, usque 

 ad O.016 mm longis et O.005 mm crassis descripta, hue non pertinent. 

 Conf. sub Cyrtidio elachistotero. 



8. Arthopyrenia (Mass.) Vain. 



Mass. Ric. Lich. Crost. (1852) p. 165 (em.); Vain. Etud. Lich. 

 Bres. II (1890) p. 233. 



Thallus crustaceus, uniformis, gonidiis instructus, rhi- 

 zinis destitutus, strato corticali nullo. Apothecia gonidiis 

 hymenialibus nullis. Perithecium rectum, fuligineum. Para- 

 physes ramoso-connexae. Sporae 8:nae aut pauciores, deco- 

 lores, ovoideae aut oblongae ellipsoideaeve aut fusiformes 

 (haud aciculares), 1 — 5-septatae, loculis subcylindricis (haud 

 lenticularibus). Gonidia ad Trentepohliam pertinentia (aut 

 raro pleurococcoidea). 



1. A. gemmata (Ach.) Mass. 



Ric. Lich. Crost. (1852) p. 166. Lichen gemmatas Ach. Lich. Suec. 

 Prodr. (1798) p. 17. Verrucaria Ach. Lich. Univ. (1810) p. 278; Fr. Lich. 

 Eur. Ref. (1831) p. 444; Nyl. Exp. Pyrenoc. (1858) p. 53 (excl. A. tersa 



