Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 15 



aut adscendentibus, plus minusve complicatis convolutisque, 

 irregulariter crenatis, subumbilicatus, gompho gomphisve 

 nonnullis aff'xus, humidus sat flaccidus, sat tenuis, superne 

 fuscus, haud pruinosus, subtus obscure testaceus, haud 

 pruinosus, superne et subtus sat laevigatus. Stratum me- 

 dullare hyphis parum conglutinatis. Sporae ellipsoideae. 



Distr. Ad fissuram in latere lacum versus sito rupis. 

 Karelia Ladogensis: Variskallio in Kirjavalahti (J. P. Norrlin). 



Minutie thalli differt a D. fluviatili var. Weberi (Ach.) et 

 thallo haud pruinoso a D. leptophyllode (Nyl.) Vain, in Havaas 

 Lich. Exs. Norv. (1914) n. 472, quod thallo cinereo-pruinoso 

 accedit ad D. fluv. var. decipientem (Mass.). Thallus siccus crass. 

 0,120 — 0,060 mm, ad apothecia paullo crassius, humidus crass. 0,220 

 — 0,i6o mm. Gonidia pleurococcoidea, globosa aut subglobosa, 

 simplicia diam. 0,006 — 0,oio mm, etiam 2 — 3-cellulosa visa. Stra- 

 tum medullare hyphis 0,003 — 0,004 mm crassis, sat leptodermaticis. 

 Stratum corticale superius 0,oio — 0,015 mm crassum. Stratum cor- 

 ticale inferius circ. 0,025 mm crassum, plectenparenchymaticum, 

 leviter pachydermaticum, cellulis circ. 4 — 3 in serie superpositis, 

 cavitatibus irregularibus, circ. 0,0025 — 0,005 mm latis. Apothecia 

 crebra, margine ostiolari verruculam formante. Nucleus jodo caeru- 

 lescens. Periphyses numerosae, constipatae, long. circ. 0,oh, crass. 

 0,002 mm, pauciseptatae. Paraphyses in gelatinam diffluxae. Asci 

 subventricosi, long. 0,oso, crass. 0,012 mm, membrana gelatinosa, 

 sat tenui. Sporae 8:nae, distichae, decolores, ellipsoideae, apici- 

 bus rotundatis aut rarius obtusis, simplices, saepe 1 — 2-guttu- 

 losae, long. 0,007 — 0,on, crass. 0,004 — 0,005 mm, membrana tenui. 



5. D. deminuens Vain. (n. sp.). 



Thallus pusillus, circ. 8—3 mm latus, subpolyphyllus, 

 caespites parvos formans, imbricato-lobatus, lobis sat ad- 

 pressis aut concavis marginibusque adscendentibus, gompho 

 uno aut gomphis nonnullis affixus, sat tenuis, superne laevi- 

 gatus, obscure cinerascens vel cinereo-nigricans, tenuiter 

 pruinosus, subtus fusco-nigricans aut rarius testaceo-fu- 

 scescens, haud pruinosus. Stratum medullare hyphis parum 

 conglutinatis. Sporae oblongae aut parcius ellipsoideae. 



Distr. In rupe granitica decliva in monte Korkmaki in 

 par. Finby in Regione Aboensi (Vain.). 



Proxima D. meiophyllo Vain. (Norrl. et Nyl. Herb. Lich. Fenn. 



