1921 



Third Report on Floral Areas 



209 



THIRD REPORT OF THE COMMITTEE ON FLORAL AREAS. 



The present report, covering all the families of the Fern Allies 

 except Isoetaceac follows the lines of its two predecessors, 1 giving a 

 check list of the New England species and a geographic grouping of 

 them according to their ranges within our area. In the check-list 

 are included all varieties recognized in Gray's Manual and nearly 

 all proposed in subsequent revisions; some of these, which appear to 

 be mere forms without distinctive or significant ranges are, however, 

 omitted in the geographic treatment. The nomenclature is that of 

 the Manual somewhat modified by the studies mentioned. The 

 principal changes are: the restoration of the old sixth edition name 

 Equisetum limosum in place of E. fluviatile, a change which proves to 

 be required by the International Rules 2 ; and the substitution of 

 Botrychium dissectum for B. obliquum, the former being the earliest 

 name in the group. 3 One of the Manual varieties calls for a new 

 combination under B. dissectum: in making the transfer, this variety 

 is here reduced to a form, since that appears to be its correct taxo- 

 nomic status. 4 



PRELIMINARY LISTS OF NEW ENGLAND PLANTS— 



XXVIII. 



[The sign + indicates that an herbarium specimen has been seen: 

 the sign — that a reliable printed record has been found.] 



Ophioglossacea e 



Botrychium angustisegmentum (Pease 

 & Moore) Fern aid . 

 dissectum Spreng. . . 

 f. elongatum 

 (Gilbert & 

 Haberer) 

 Weatherby 





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£ 



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1 Rhodora xx. 181-185; 193-197 (Oct., Nov., 1918): xxii. 80-89 (May, 1930). 

 1 Rhodora xxiii. 43-47 (Apr.. 1921). 

 J See Olute. Fern Bull. x. 7<i (1902). 



"Botrychium dissrctlim Spreng., f. elongatum (Gilbert & Haberer) Weatherby, 

 n. comb. H. obHQUum tkmgatum Gilbert & Haberer. Fern Bull. xi. 89 (July, 1903). 



