(332) 



figured by Tode * in 1791, but it was defined in its modern 

 sense by Bonardin f in 185 1. It includes those dematiaceous 

 fungi having erect, simple, usually septate conidiophores 

 bearing simple conidia in a somewhat compact head at the 

 more or less enlarged apex, without special basidia. 



The North American species may be distinguished by the 

 following synopsis : 



Key to the North American Species of Periconia. 



1. Conidia globose, brown. 2 - 

 Conidia ovate, oblong, etc. IO - 



2. Conidia roughened, echinulate, etc. 3- 

 Conidia nearly or quite smooth. 8. 



3. Conidiophores densely gregarious, forming velvety areas, substratum 



blackened. 4« 



Conidiophores scattered, substratum not blackened. 7- 



4. Conidia large, 10 (i or more. 5- 

 Conidia small, less than 10 /i. 6. 



5. Capitulum apical. I. P- byssoides. 

 Capitulum lateral (near the apex). 2. P. lateralis. 



6. Conidiophores unbranched, rough, on -woody twigs, etc. 3. P. comnwnsii. 

 Conidiophores occasionally branched above, smooth, 



shining, on grasses and sedges, etc. 4- P- nigriceps. 



7. Conidiophores 400-500 //, conidia 10-14 /*• 5- P- epiphylla. 

 Conidiophores 150-300 fi, conidia 16-18 ft. 6. P. Palmeri. 



8. Conidia large, 8-10 ft. 7- P- opaca. 

 Conidia small, 2-3 fi. 9- 



9. Conidiophores fascicled, conidia agglutinate. 8. P. Langloisii. 

 Conidiophores not fascicled, conidia separating. 9. P. tenuisnma. 



10. Conidia colorless, 8-15 // long. 10. P. albiceps. 

 Conidia yellowish, minute, spermatoid. II. P. abietma. 



I. Periconia byssoides Pers. Syn. Fung. 686. 1801. 



S-porocybe byssoides Fr. Syst. Myc. 3: 343. 1829. 



Periconia fycnospora Fresenius, Beitrage zur Myk. 20 : 

 fl. 4.. f. 1. 1850. 



Widely effused over blackened areas ; conidiophores gre- 

 garious, erect, fuscous, often somewhat curved and lighter 

 or subhyaline above, sparingly septate, tapering upwards, 

 y 2 -i mm. long, about 17// thick at base, tapering to about 



* Fungi Meckleubcrgensis Selecti Fasc. 2: 2. 1791. 

 | Ilandbuch der Allgcmeinen M\ kologie, 112. 1851. 



