ISOiiTACfiAE (^QUILLWOKI' FAMILY) 59 



V. Leaves reddish or ollve-green, 



Gynospores averaging 440 ii. in diameter, with small pits . . 4. I.foveolata. 

 Gynospores averaging 610 fi in diameter, with thin irregular 



walls ... (4) I./oveolata, v. plenospora. 



o. Leaves green d, 

 d. Gynospores with jagged crests. 



Gynospores averaging 600 iu, in diameter; crests tall, mostly 



^ simple 6. I.riparia. 



Gynospores averaging less than 650 ii. in diameter ; crests low, 

 simple or reticulated. 

 Leaves 1-2.5 mm. in diameter ; trunks 2-lobed . . . 6. /. saccharaia. 

 Leaves 1-1.5 mm. in diameter: trunks 3-5-lobed (6) T. saccfiarata, y. Amesii. 



d, Gynospores with slender or .lagged spines. 



Leaves short, stout, spreailing 1.1. ecMnospora, v. Sramiii. 



, „ „, Leaves long, fine, spiral (7)7. ecMnospora, y. muricata. 



S S. Plants of the extreme edges of ponds or streams, emersed most of the 



summer, with stomata and bast-bundles. — Pai.6stees A. A. 



Eaton e. 



e. Bast-bundles 4, one at each front angle and one at each end of the 



dorsi-ventral partition /. 



/. Polygamous ; androsporangia rare ; gynospores appearing abortive. 



Bast-bundles often absent; gynospores witn labyrinthiform 



„ ridges 8. I.Eatoml. 



Bast-bundles always present ; gynospores with truncate col- 

 umns ... . " 9. /. 



/. Monoecious, 



Gynospores with coarse irregular crests. 



Crests loose ; sporangia slightly spotted 10. /. „_.. 



Crests crowded ; sporangia densely spotted . . (10) /. Dodgei, v. 'jlobbinHi. 

 Gynospores reticulated. 

 Plants of medium size; androspores smooth . . . .11. I. Engelmnnni. 

 Plants large ; androspores spinulose .... (11) /. Xngelmatmi, v. valida. 

 6. Bast-bundles 4, with accessory ones in the periphery. 



Monoecious; gynospores crested, somewhat reticulated (11) I. Bngelmannt, v.fontama. 

 Polygamous ; gynospores small, smooth or with low tubercles or 



wrinkles 12. 7. mekmopoda. 



I 4. Plants of dry situations ; leaves setaceous ; bast-bundles 4 ; stomata 



many ; velum none. — TEKKfisTREs A. Br 18. 7. ^ 



1. I. macrdspora Dur. Leaves 10-30, 2 mm. in diameter, erect, round, dark 

 green, rather blunt; velum covering ^ of the unspotted sporangium ; gynospores 

 600-800 /M in diameter, the upper faces traversed by thin parallel 



walls, the lower hemisphere reticulated ; androspores 36-47 /i 

 (average 42 fi) long, smooth. — Gasp6 Co., Que., and Me. to 

 Ont. and Minn. Fig. 25. 



Var. heterfispora A. A. Eaton. Leaves SO-^ISO, 2 mm. in 

 diameter, 5-8 cm. long, rigid, erect, tapering to a sharp point; 

 sporangia spotted -J-J indusiate ; gynospores 540-675 n (some 

 abnormally 1100-1184 /i) in diameter, densely covered with 

 thick jagged convoluted crests, often reticulated below ; andro- ^^- '• macrospora. 

 spores 30^0 j« (average 35 fi) long, dark brown, papillose. Gynospore x 16. 

 (7. heterospora A. A. Eaton.) — Jordan Pond, Mt. Desert, Me. 



2. I. Tuckermani A. Br. Trunk often 3-lobed, small ; leaves 10-40, 1 mm. 

 or less in diameter, 4-15 cm. long, reddish or olive green, sometimes with a 

 few stomata but no bast^bundles ; sporangia small, rarely spotted, -J or more 

 covered by the velum ; gynospores 450-750 /i (average 600 li) in diameter, 

 parallel-walled or reticulated above, more or less reticulated below ; andro- 

 spores 25-38 fj, (average 30 fi.) long, slightly rough. — Sandy ponds, Me. to Ct. 



Var. boreills A. A. Eaton. Trunk bilobed ; leaves 10-100, 3-25 cm. long, 

 1-1.5 mm. thick, green or reddish, straight or recurved; stomata none; 

 gynospores 600-785 /i in diameter, more coarsely reticulated ; androspores 42 /i 

 long, finely spinulose. — N. Y. to N. H. and Lab. 



Var. Harvfiyi (A. A. Eaton) Clute. Trunk 2-lobed, 1.6-3 cm. in diameter; 

 leaves 50-140, purple-bronze, 2.5-3 ram. in diameter, 5-6 cm. long, strongly re- 

 curved ; stomata none ; sporangia unspotted, J-| covered by the velum ; gyno- 

 spores 526-648 M (average 560 fi) in diameter ; androspores 30-39.6 ^ (average 

 34 /li) long. (/. Harveyi A. A. Baton.) — N. Y. and Mass. to Nfd. 



3. I. hierpglyphica A. A. Eaton. lyeaves 10-20, 6-7.5 cm. long, 1-2 mm. in 

 diameter, blunt, recurved ; sporangia not spotted, ^ covered by the velum ; 



