14 E. A. Vainio, Pyrenocarpeae. 



ob causam nominanda est Heppia euploca (Ach.). Specimen in Scotia 

 collectum, in scriptis Acharii baud commeraoratum, ad earn non perti- 

 net. Quid sit Anglica Verrucaria euploca Borr. (Dermatocarpon aqua- 

 ticum var. euplocum A. Sm. 1. c), nescimus; specim. orig. cum sporis 

 in Leight. Brit. Angioc. Lich. tab. 2 f. 3 delineatum est. 



3. D. meiophyllizum Vain. (n. sp.). 



Thallus pusillus, circ. 15 — 7(— 5) mm latus, simplex, 

 umbilicatus et gompho affixus, adscendens, subinteger aut 

 uno latere usque ad gomphum fissus ibique parce lobatus, 

 sat tenuis, humidus sat flaccidus, superne olivaceo-cinera- 

 scens vel cinereo-fuscescenti-variegatus, haud pruinosus, 

 subtus fusco-nigricans aut rarius testaceo-fuscescens, haud 

 pruinosus, superne et subtus laevigatus. Stratum medullare 

 hyphis partim conglutinatis. Sporae ellipsoideae. 



Distr. Supra rupem graniticam saepe inundatam in 

 rivulo ad Tali in par. Helsinge et in latere rupis subirrigato 

 in Gesterby in par. Sibbo in Nylandia (Vain!). 



Intermedia est inter D. fluviatilem var. Weberi (Ach.) et D. 

 polyphyllizum (Nyl.), ab ambobus thallo simplice, haud complicates 

 differens. A v. decipiente (Mass.) thallo haud pruinoso recedens. 

 Thallus vulgo concavus, raro convolutus, siccus crass, circ. 0,i8o 

 — 0,120 mm, humidus 0,3oo — 0,no mm, saepe pulvere inspersus 

 albido, e crystallis acicularibus, in aqua facile dissolutis. Gonidia 

 pleurococcoidea, globosa aut subglobosa, simplicia diam. O.oos— 

 0,006 mm, membrana modice incrassata. Stratum medullare hy- 

 phis 0,oo3 mm crassis, sat leptodermaticis. Stratum corticale 

 superius 0,020 mm crassum, plectenparenchymaticum, leptoderma- 

 ticum, cellulis superpositis 4 — 3. Stratum corticale inferius 0,040 

 — 0,o6o( — 0,o7o) mm crassum, leviter pachydermaticum, plecten- 

 parenchymaticum. Apothecia et conidangia in thallis diversis visa. 

 Apothecia haud prominentia. Periphyses long. circ. O.020, crass. 

 0,003 mm. Paraphyses in gelatinam diffluxae. Sporae decolores, 

 ellipsoideae aut oblongae, apicibus rotundatis, simplices, long. 

 0,oii — 0,oi4, crass. 0,oo6— 0,oos mm. Conidia cylindrica, recta, api- 

 cibus rotundatis, long. 0,oo4 (0,003 — 0,005) mm, crass. 0,ooot mm. 



4. D. polyphyllizum (Nyl.) Vain. 



Endocarpon polyphyllizum Nyl. Fl. 1875 p. 362; Norrl. Symb. Fl. 

 Ladog.-Karel. (1878) p. 31; Hue Addend. II (1888) p. 269. 



Thallus pusillus, circ. 7—2 mm latus, polyphyllus, cae- 

 spites parvos formans, imbricato-lobatus, lobis sat adpressis 



