Leaves without a border — 



Leaves obtuse, cells pellucid, operculum, conic, . . . 



F. obttisifolhis. 



Leaves apiculate, operculum acicular-rostrate, . . . , 



F. osumndoides. 



B. — FRUIT LATERAL. 



Leaves without a border — 



Leaves broad pointed, irregularly serrulate; fruit sub- 

 basal; plants i-2cm. high, . . . . F. subhasilaris. 

 Leaves mucronate, regularly serrulate; fruit basal or sub- 

 basal F. taxifolins. 



Leaves bordered by several rows of paler, often incrassate 

 cells — 

 Leaf cells obscure (6-9X6-12//), capsule erect or in- 

 clined, F crtstatus Wils*. 



Leaf cells distinct ( 12-15X18-24/O capsule erect or in- 

 clined F. adiantoides. 



C. — PLANTS AQUATIC. 



Plants sterile, large ( s-iscrn.), growing in very wet places or 



in water. Leaves thick, rigid, opaque. F. grand if rons. 



Plants filiform, much branched, aquatic and floating, with 



the habit of a Fontinalis. Leaves not rigid, F. Julianus. 



*F. decipiens L. & J. Manual. 



The ten species above given are those most likely to be col- 

 lected in our range. Of the aquatic series only F. grandifrons 

 Bridel and F. luliamis cSavi.) Schimp. are included, though 

 F. Hallianiis Mitt, may be found more rarely on wood and 

 stones in swamps and streams. F. grandifrons Bridel has been 

 found over a wider range than is given in the Manual and 

 should be looked for in many limestone regions. Owing to its 

 large size it will not be overlooked if present at all. F. Closteri 

 Aust. and F. hyalinus Hook. & Wils. have been omitted as being 

 too rare and also too minute to be often found by a beginner, for 

 whom this key and notes are intended. F. polypoidoides Hedw. 

 has also been left out, as it is sub-tropical only. It is found in 

 Florida and in the southern half of Georgia. 



Of the species given in the key, F. subhasilaris Hedw. is 

 reported as not common. I have it from two stations only, one in 

 New York State and the other near Baltimore. It is a small 

 plant and therefore easily overlooked ; this applies as well to 

 F. bryoides Hedw., which may sometimes be found growing on 

 greenhouse pots. F. incurvus Schwaegr. is another small plant 

 very common East. There are two varieties as given by Prof. 

 Barnes in his Revision, namely, van miniitulus Aust. and var. 

 exiguus Aust. Authors differ about the specific rank of these three 

 mosses, but this question will not be be considered now, as one 



