PSILOPEZIA 109 



paraphyses rather strongly enlarged above, reaching a diameter 

 of 7-8 fx. 



On stones and water-soaked logs. 



Type locality: Europe. 



Distribution: New York and New Jersey to Minnesota and 

 Utah; also in Europe. 



Illustrations: Hedwigia 2: pi. 10, f. 3; Cooke, Mycographia 

 pi. 12, f. 47 and pi. 23, f. 89; Massee, Brit. Fungus-Fl. 4: 290, 

 /. 10-13; Fest. Asch. 483,/. 1-6. 



Doubtful and Excluded Species 



Psilopezia mirahilis Berk. & Curt.; Berk. Jour. Linn. .Soc. 10: 364. 1869. 

 The species, which is very imperfectly described, is said to occur on twigs and 

 to look like a Corticinm. 



15. PYRONEMA Carus, Nov. Act. Acad. Nat. Cur. 



17:370. 1835. 



Vegetative mycelium superficial, hyaline (white in mass), 

 thin-walled, septate, branched, the branches proceeding almost 

 at right angles to the main hypha, frequently anastomosing, 

 filled with conspicuous vacuoles, giving rise to paired sex organs; 

 sex organs occurring in clusters of several pairs each, each pair 

 consisting of a clavate antheridium and an inflated oogonium 

 surmounted by a slender trichogyne, which at a later stage 

 usually fuses with the oogonium, each cluster of sex organs 

 finally giving rise to a compound apothecium; apothecia open 

 from the first, never enclosed by the excipulum; asci cylindric, 

 8-spored; spores ellipsoid, hyaline, smooth; paraphyses filiform. 



Type species, Pyronema Marianum Carus.-' 



1. Pyronema omphalodes (Bull.) Fuckel, Symb. Myc. 319. 

 1869. (Plate 10.) 



Peziza omphalodes Bull. Herb. Fr. pi. 485, f. 1. 1790. Hist. Champ. 264. 



1791. 

 Peziza confliiens Pers. Obs. Myc. 2: 81. 1799. 



Pyronema Marianum Carus, Nov. Act. Acad. Nat. Cur. 17: 370. 1835. 

 Pyronema confluens Tul. Fung. Carp. 3: 197. 1865. 

 Aleuria omphalodes Gill. Champ. Fr. Discom. 48. 1879. 

 ?Pyronema aurantioriihriim Sacc. Syll. Fung. 8: 108. 1889. 

 Tapesia omphalodes Quel. Ench. Fung. 291. 1886. 

 Humaria omphalodes Massee, Brit. Fungus-Fl. 4: 410. 1895. 



Apothecia small, not usually exceeding 1-2 mm. in diameter, 

 soon becoming confluent and forming congested masses several 



