676 LYCOPODIACE^E. (CLUB-MOSS FAMILY.) 



cies; macrospores (0".32-0".38 wide) covered with short and twisted crested 

 ridges, which often anastomose ; microspores (0".017-0".020 long) smooth. 

 Mountain lakes, Penn., New York, and New England to Lake Superior, and 

 northward often with No. 3. (Eu.) The American is distinguished from the 

 European plant by the larger macrospores, therefore I. macrdspora, Durieu. 



2. I. Tuckermani, Braun, n. sp. Leaves (10-30, 2' -3' long) very 

 slender, awl-shaped, olive-green, the outer ones recurved ; sporocarps ovoid or 

 circular, the upper third covered by the velum, the free part sometimes brownish- 

 spotted; macrospores (0".22 - 0".28 wide) on the upper segments covered with 

 parallel and anastomosizing ridges, the lower half reticulated; microspores 

 (0".013-0' r .015 long) smooth or very delicately papillose. Mystic and other 

 ponds near Boston, together with the next, Tuckerman, W. Boott. 



3. I. echinbspora, Durieu. Leaves slender, awl-shaped; sporocarps 

 ovoid or circular; macrospores (0".20-0".25 wide) beset all over with small 

 entire and obtuse or slightly forked spinules. (Eu.) In the European form, 

 which has not yet been found in America, the leaves are very slenderly attenu- 

 ated (3' -4' long), the upper margin of the sporocarp only is covered with the 

 narrow velum, the free part is unspotted, and the slightly papillose microspores 

 are larger (0".015-0".016 long). The following are the American forms of 

 this species. 



Var. Bratinii. Leaves (15-30 in number, 3' -6' long) dark and often 

 olive-green, straight or commonly recurved, half or two thirds of the sporocarp 

 covered by the velum, the free part often with light brown spots ; macrospores 

 as in the species ; microspores smaller (0".013 -0".014 long), smooth (I. Braunii, 

 Durieu.} Ponds and lakes, New England to New York, Penn., and north- 

 ward, often with the two preceding. Often with a few stomata, especially in 

 Niagara specimens. 



Var. muricata. Leaves (15-30, 6' -10' long) straight or flaccid, bright 



green ; about one half of the almost circular sporocarp covered by the velum, 



unspotted ; macrospores (0".22-0".27 wide) with shorter and blunter spinules ; 



' microspores as in the last variety, or rarely spinulose. (I. muricata, Durieu.} 



In some ponds north of Boston, W. Boott. 



Var. Bodttii. Leaves (12-20, 4' -5' high) awl-shaped, stiffly erect, bright 

 green, with stomata ; sporocarp as in last ; macrospores as in the species, but a 

 little smaller and with very slender spinules. (I. Boottii, Braun, in litt.) Pond 

 in Woburn, near Boston, partly out of water, W. Boott. 



* * Growing partly out of water, either by the pond drying up, or by the receding of 

 the ebb tide ; leaves with stomata, and in 6 and 7 with Jour or more peripherical 

 bast-bundles. 



4. I. saccharata, Engelm., n. sp. Leaves (10-15, 2' -3' long) slender, 

 olive-green, curved ; sporocarps small, ovoid, only the upper edge covered by the 

 velum, nearly unspotted; macrospores (0".20-0".22 wide) minutely tubercu- 

 late; microspores (0".012 long) papillose. On Wicomico River, eastern shore 

 of Maryland, between high and low tide, W. M. Canby. 



5. I. riparia, Engelm. Leaves (15-30, 4' -8' long) slender," deep green, 

 erect; sporocarps mostly oblong, upper margin to one third covered by the 



