1922] 



PFEIFFER MONOGRAPH OF THE ISOETACEAE 81 



the earlier authors, as, for example, Schnizlein, who credits 

 Bartling as the originator of the family name in the text and 

 Richard in the legend on the plate illustrating his paper. 



References occur twice which suggest that Claude Richard was 

 responsible for the idea of a separate family containing the 

 Isoetes species. Delile himself in 1827 places the genus between 

 Lycopodium and Marsilea, but says that Richard believes it a 

 family distinct from Lycopodium and other ferns. Again, in 

 1844, we have the statement of Bory that Claude Richard be- 

 lieves that Isoetes ought to be considered as a separate family 

 from other ferns. It has been impossible to find any account 

 published by Richard himself in regard to this point. 



Within a short interval after Delile's work on /. setacea Bosc, 

 much interest was stimulated in the genus through the work of 

 two investigators, A. Braun and Durieu de Maisonneuve. The 

 former developed not only systematic, but much morphological, 

 knowledge in regard to various species. The latter was chiefly 

 instrumental in augmenting systematic information, especially in 

 regard to Algerian species. 



In 1867, Milde 1 brought together forms that occur within a 

 relatively much larger territory than had been previously con- 

 sidered. An idea may be obtained of the various contributions, 

 especially of Braun and Durieu, from the fact that by this time 

 the number of species within the range of Milde's work is 15. 



A synopsis of the species of Isoetes was published within a 

 little over a decade by Baker 2 , who later incorporated the same 

 manuscript with little additional material in his 'Fern Allies'. In 

 this synopsis, 46 species are brought together by the author 

 whose primary divisions are on the basis of geography. 



Following Baker's work, Motelay and Vendryes 3 monographed 

 the genus, including 47 species. The work is enhanced by the 

 illustrations which include those of many spore forms. Not a 

 few of the forms considered in Baker's synopsis and in the 

 monograph by Motelay and Vendryes were due to the activity 

 of Engelmann. 4 



1 Milde, J. Filices Europae et Atlanticis, Asiae minoris et Siberiae, 274-290. 

 1867. 



'Baker, J. G. A synopsis of the species of Isoetes. Jour. Bot. 18: 65-70, 

 105-110. 1880, and Fern Allies, 123-134. 1887. 



'Motelay, L. et Vendryes. Monographic des Isoeteae. Soc. Linn, de Bordeaux, 

 Actes 36 : 309-405. pi. 8-17. 1883. 



'Engelmann, G. The genus Isoetes in North America. St. Louis Acad. Sci., 

 Trans. 4: 358-389.1882. 



