Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 217 



Paraphyses simplices et demum partim in gelatinam diffluxae. 

 Sporae 8— 4:nae, decolores, aciculares aut filiformes, tenues, 

 transversim pluriseptatae, loculis cylindricis. Thallus go- 

 nidia ad Trentepohliam pertinentia continens. 



1. Rh. trichosporella (Nyl.) Vain. 



Mycoporum trichosporellum Nyl. Fl. 1874 p. 14; Hue Addend. II 

 (1888) p. 313. Leptorhaphis Minks Gonang. (1876) p. 530. Mycoporellum 

 Zahlbr. Ascolich. (1903) p. 78. 



Thallus (nisi alienus) stramineo-albidus aut subalbidus, 

 tenuis aut sat tenuis, continuus, sat laevigatus aut leviter 

 verruculoso-inaequalis, sat opacus aut leviter nitidus. Apo- 

 thecia crebra, verrucas formantia hemisphaericas, O.120— O.150 

 mm latas, nigras, nudas, opacas. Perithecium depresso- 

 subglobosum aut subhemisphaericum, fuscum, dimidiatum, 

 thallo subadnatum aut basi leviter immersum, ostiolo regulari 

 nullo, in macula dilutius colorata demum aperturam diiformem 

 formans. Paraphyses numerosae, simplices, partim demum 

 in gelatinam diffluxae. Asci fusiformes aut rarius sub- 

 cylindrici, membrana tenui, long. circ. O.090 — O.no, crass. 

 O.010 — O.012 mm. Sporae filiformi-aciculares, apicibus acutis, 

 decolores, 1 — 5-septatae, long. circ. O.oes, crass. O.002 mm, 

 observante Nyl. Jong. 0.065 — O.105, crass, circ. O.0025 mm". 



Distr. Ad corticem Betulae in regione deserta silvosa 

 pagi Nyystola in Padasjoki Tavastiae austr. (Vain.). 



A Leptorhaphide et Campglacia differt reactione jodetica 

 nuclei, a ,,Mycoporis" structura perithecii haud globoso-cellulosi, 

 sporis et reactione jodetica nuclei. Thallus sec. Nyl. „forsan alie- 

 nus". Apotheciorum vestigia Opegraphae pulicaris, solae compa- 

 rabilis, semper fertilis, nulla in eo adsunt. — Gonidia ad Tren- 

 tepohliam umbrinam pertinentia, cellulis oblongis aut ellipsoideis 

 aut subglobosis, O.010 — O.012 mm crassis, constricte concatenatis. 

 Perithecium tenue, ex hyphis formatum subparallele radiantibus, 

 O.002 mm crassis, conglutinatis, cellulis oblongis aut ellipsoideis, 

 demum aperturam difformem, saepe lateralem formans. Nucleus 

 gelatinosus, parce resinoso-guttulosus, jodo dilute roseus aut 

 fulvescenti-rubescens, metaplasmate rubescente. Paraphyses crass. 

 O.001 — O.0015 mm, ascorum longitudine, partim in gelatinam diffluxae. 

 Asci fusiformes aut rarius subcylindrici, apice obtuso, membrana 



