154 Cincinnati Society of Natural History. 



Genus 23. Physarum. 

 1. P. contextuni ; 2. P. coufluens ; 3. P. bivalve ; 4. P. ci- 

 nereum ; 5. P. hyalinum ; 6. P. muscicola; 7. P. nutans; 8. 

 P. luteum ; 9. P. viride ; 10. P. aureum ; 11. P. aurantium ; 

 12. P. columbinum ; 13. P. squamulosum ; 14. P. tigrinum ; 

 15. P. farinaceum ; 16. P. (?) globuliferutn. 



Genus 24. Trichia. 

 1. T. botrytis; 2. T. rubiformis ; 3. T. fallax ; 4. T. cla- 

 vata; 5. T. nigripes ; 6. T. ovata ; 7. T. olivacea ; 8. T. ni- 

 tens; 9. T. varia; 10. T. serpula ; 11. T. reticulata. 



Genus 25. Arcyria. 

 1. A. (?) leucocephala ; 2. A. flava; 3. A. cinerea; 4. A. in- 

 carnata; 5. A. punieea. 



Genus 26. Stemonitis. 

 1. S. leucostyla ; 2. S. typhina ; 3. S. fasciculata ; 4. S. pa- 

 pillata ; 5. S. ovata. 



Genus 27. Cribraria. 

 1. C. cernua; 2. C. coceinea; 3. C. microcarpa ; 4. C. splen- 

 dens; 5. C. venosa; 6. C. macrocarpa ; 7. C. rufescens; 8. 

 C. argillacea ; 9. C. vulgaris; 10. C. tenella ; 11. C. intrieata. 



§2. GYMNOSPERMI. 



Genus 28. Licea. 

 1. L. bicolor ; 2. L. cireumseissa ; 3. L. pusilla ; 4. L. va- 

 riabilis ; 5. L. flexuosa. 



Genus 29. Tubueina. 

 1. T. fallax; 2. T. fragiformis. 



The Synopsis of Persoon greatly facilitated the labors of 

 students, and, no doubt, was a great stimulus to the study of 

 the Fungi in all parts of Europe. Numerous publications 

 appeared in the interval between it and the next great work 

 upon the Fungi by EHas Fries. 



Nees ab Esenbeck, in his elaborate " Das System der Pilze 

 und Schwamme " ( 1817), placed the Myxomycetes in the third 



8 



