ISOfiTACEAE (SQUILL WORT FAMILY) 59 



c. T,*aves reddish or olive-green. 



Gynospores averaging 440 /u. in dianoeter, with small pits . . 4. I.foveolata 



Gynospores averaging 510 (x in diameter, with thin irregular 



^'^^^^ ; (4) I.foveolata, v. plenospora, 



0. Leaves green d. > ^ ^ ". 



d. Gynospores with jagged crests. 



Gynospores averaging 600 /u, in diameter; crests tall, mostly 



^simple 5, L riparia. 



Gynospores averaging less than 550 /it in diameter ; crests low, 

 simple or reticulated. 

 Leaves 1-2.5 mm. in diameter ; trunks 2-lobed . . . 6. 7. saecharata 



Leaves 1-1.5 mm. in diameter ; trunks 2-5-lobed (6) /. saecharata, v. Amesii 



d. Gynospores with slender or jagged spines. 



Leaves short, stout, spreading 7. /. echinospora. v. Braunii 



» « T,, Lejives long, fine, spiral (7) /. echinospora, v. muricata. 



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



summer, with stomata and bast-bundles. — Palustres 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 with labyrinthiform 



T, /l^^®^, •, 8- I.Eatoni. 



Bast-bundles always present ; gvnospoi-es with truncate col- 



. ^, "^'ns " 9. 7. Gravesii. 



J. Monoecious. 



Gynospores with coarse irregular crests. 



Crests loose ; sporangia slightly spotted 10. 7. Dodgei. 



Crests crowded ; sporangia densely spotted . . (10) 7. Dodgei, v. Ho'bbinsii 

 Gynospores reticulated. 

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

 Plants large ; androspores spinulose .... (11) 7. Engelmanni, v. valida. 

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



Monoecious ; gynospores crested, somewhat reticulated (11) 7. Engelmanni, Y.fontana 

 Polygamous ; gynospores small, smooth or with low tubercles or 



c^ T>i ^ wrinkles • 12. I. melanopoda. 



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



many ; velum none. — Terrestres A. Br 13. 7. Butleri. 



1. I. macr6spora Dur. Leaves 10-30, 2 mm. in diameter, erect, round, dark 

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

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

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

 (average 42 /i) long, smooth. — Gaspe Co., Que., and Me. to 

 Ont. and Minn. Fig. 25. 



^ Var. heter6spora A. A. Eaton. Leaves 50-150, 2 mm. in 

 diameter, 6-8 cm. long, rigid, erect, tapering to a sharp point; 

 sporangia spotted \-\ indusiate ; gynospores 540-675 /i (some 

 abnormally 1100-1134 fx) in diameter, densely covered with 

 thick jagged convoluted crests, often reticulated below ; andro- 2^- ^- macrosport. 

 spores 30-40 ^ (average 35 /x) long, dark brown, papillose, ^y^ospore x 15. 

 (/. 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, i or more 

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

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

 spores 25-38 ^l (average 30 fx) long, slightly rouoh. — Sandy ponds, Me. to Ct. 



Var. borealis 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 /* in diameter, more coarsely reticulated ; androspores 42 /i 

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



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

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

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

 spores 526-648 ^l (average 560 /i) in diameter ; androspores 30-39.6 /t (average 

 34 ix) long. (/. Harveyi A. A. Eaton.) —N. Y. and Mass. to Nfd. 



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

 diameter, blunt, recurved ; sporangia not spotted, ^ cove.red by the velum ,• 



