March 1907] Tliird Supplement to New Genera 63 



THIRD SUPPLEMENT TO NEW GENERA OF FUNGI 

 PUBLISHED SINCE THE YEAR 1900, WITH 

 CITATIONS AND ORIGINAL DE- 

 SCRIPTIONS. 



COMPILED BY P. L. RICKER. 



I. Myxomycetae. 



[Myxomycetae.] 

 LiSTERELLA E. Jahti. n. g. Listerellaceae. Berichte der 

 Deutschen Botanischen Gesellschaft, 24:541. pi. 22. 1907. 



"Sporangia sparsa, hemisphaerica, basi applanata, regulariter 

 valvatim dehiscentia, atra, cc. min. lata. Peridium simplex 

 fuscescens tectum quasi altera membrana, quae exeiectis granulis 

 aliisque plasmodii purgamentis constituta est. Tubuli capillitii 

 tennes, e margine valvarum enascentes, cateniformes, medii ex 

 membris calyciformibus compositi. Sporidia pallide umbrina, 

 fere laevia 7-8/A diam." 



[Myxomycetae.] 

 Listerellaceae E. Jahn. 11. fam. Myxogastrales. Berichte 

 der Deutschen Botanischen Gesellschaft 24:541. 1907. 



Characters of the family same as of its type Listerella q. v. 



III. Phycomycetae. 



[ Phycomycetae. ] 

 Eurychasma Magnus, n. g. Chytridiaceae. Hedwigia, 44: 

 348. f. 1. 1905. 



Based on Rhizophidium Dicksonii E. P. Wright, Transac- 

 tions of the Royal Irish Academy of Sciences, 26:20. pi. 3. 1877. 



[Phycomycetae.] 

 Eurychasmaceae Petersen, n. fam. Chytridiales. Over- 



sigt over det Kongelige Danske Videnskabernes Selskabs For- 



handlinger, 1905:469. 1905. 



"J 'attribute a cette famille un genre comprenant les trois 



especes suivantes : Eurychasma dicksonii (Wright) Magnus, E. 



sacculus mihi et E. lauderiae (Gran.) mihi." 



[Phycomycetae.] 

 PoNTiSMA Petersen, n. g. Holochytriaceae. Oversigt over 



det Kongelige Danske Videnskabernes Selskabs Forhandlinger, 



1905:482. f. 10. 1905. 



"Chytridinees endophytes depourvues de radicelles. Spor- 



anges composes lagenidioides. Reproduction par zoospores, qui 



ne s'entourent pas d'une membrane en sortant du zoosporange." 



