2»G TWENTY-FIKST REPORT. 



Povah, A. If. W. A critical study of certain species of Mucor. Bulletin of 

 the Torrey Botanical Club 14: 241-259, 287-312. Pis. 17-20. 1917. 



Thaxter, Roland. New or Peculiar Zygomycetes. 



I. Dispira. Botanical Gazette 20: 513-515. PL 34. 1895. 

 11. Syncephalastrum and Syncephalis. Ibid. 24: 1-15. Ph. 1-2. 1897. 

 FII. Blakeslea, Dissophora and Haplosporangium, Nova Genera. Ibid. 

 58: 353-366. Ph. 26-29. 1914. 



Vuillemin, Paul. Sur les Mortierella des groupes polycephala et nigrescens- 

 Bulletin trimestriel de la Societe Mycologique de France 34: 41-46. 

 Figs. IS. 1918. 



Dauphin, J. Contribution a I'etude des Mortierellees. Ann. Sci. Nat. 

 Nat. Bot. 9me Ser. 8: 1-112. Figs. 1-45. 1908. 



Harshberger, J. W. Key for the determination of species of Mucor. A 

 text-book of mycology and plant pathology. Appendix VI. 697-702. 

 1917. 

 A translation of the key to the species of Mucor from Lendner's work. 



Order Entomophthorales. 



Thaxter, Roland. The Entomophthorae'of the United States, Memoirs of 

 the Boston Society of Natural History 4: 133-201. Ph.14-21. 1888. 



CLASS ASCOMYCETE^. 

 Order Laboulbeniales . 



Thaxter, Roland. Contribution toward a monograph of the Laboulbeni- 

 aceae. (Part I). Memoirs of the American Academy of Arts and Sci- 

 ences 12: 195-429. Ph. 1-26. 1895. Part II. Ibid. 13:' 219- 

 469. Ph. 28-71. 1908. 



Order Lecanorales (Disk Lichens). 



Tuckerman, Edward. A synopsis of the North American Lichens. Part I, 

 1-261. 1882. Part II. 1-176. 1888. 



Schneider, Albert. A guide to the study of Lichens. 1-234. 1898. 



Fink, Bruce. The Lichens of Minnesota. Contributions from the United 

 States National Museum 14: 1-269. Ph. 1-51, Figs. 1-18. 1910. 

 Most of our Michigan Lichens except a few of the more southern forms 

 will be found here. 



Hasse, Hermann E. The lichen flora of Southern California. Ibid. 17: 1- 

 132. 1913. 



Ilerre, Albert \V. C. The IIcIilm lloru of the Santa Cruz Peninsula, Cali- 

 fornia. Proceedings of the Wasliingtou Academy of Science 12: 27 2(59, 

 1910. 



