5. I. Harveyi n. sp. 



Trunk deeply 2- or occasionally 3-lobed, 1.6-3 cm - in diameter : 

 leaves 50-140, short (5-6cm.), very stout and fleshy, 2.5-3111111. in di- 

 ameter, strongly recurved, with an abrupt sharp point, purple-bronze 

 in color, often reddish in drying, without bast or stomata : ligula 

 short, obtuse : velum ^-^3 indusiate, sporangium small, unspotted: 

 macrospores 526-648, abnormally 810 ,a, with irregular, parallel, 

 thickish crests above, and honeycomb-reticulate below, more 

 broken in large spores ; microspores 35. 2-39.6," long, and 22-30 fj. 

 broad, rough. 



I have hesitated somewhat whether to make this a variety of 

 Tuckermani on its spore characters, or a species on its leaf charac- 

 ters, and finally concluded that it is just as much entitled to specific 

 rank as Tuckermani itself, which in spore character is very near 

 riparia, but perfectly distinct in leaf character. Although in all 

 three of these species the general average of spores have an indi- 

 vidual appearance, some can easily be found, which, if placed with 

 selected spores of the other species, could not by any possibility be 

 separated. The group seems to be connected with lacustris by 

 riparia in spore characters, and some spores of Braunii are much 

 like some spores of lacustris. As previously remarked, spore char- 

 acters are a very unsafe basis for characterization, but one who ex- 

 amines many sets of these species will be struck with the gradation 

 from the slender spined Boottii to the beautifully reticulate Tuck- 

 er n <iaui. 



The leaves of Harveyi are relatively the stoutest of any North 

 American species, and are equalled only by the Peruvian species, 

 / Lechleri Mett., which apparently belongs to the same group. 



Pushaw Pond, Oldtown, Maine, F. L. Harvey; pond north of 

 Long Pond, Mt. Desert, Fernald in part. 



Type in the herbarium of A. A. Eaton ; co-types in the U. S. 

 National, and the University of Minnesota herbaria. 



6. I. RIPARIA Engelm. 



Polygamous : a medium sized species, with 15-30 erect, terete 

 leaves, io-3ocm. long : sporangium spotted ; velum #-# indusiate; 

 macrospores 450-650^ in diameter, with thin, jagged, irregular, 

 mostly short crests, sometimes more confluent and reticulate al- 

 most exactly intermediate in sculpture between lacustris and Tuck- 

 ermani. 



Reported from Maine, but all specimens so labeled which have 



