1056 APPENDIX. 



axis in 6-8 rows, from ovate through lanceolate-acute to acuminate, those 

 of the subterminal and terminal branchlets in four rows, glaucous, bluish 

 green, acuminate, appressed, those of the under row differing scarcely at 

 all from those of the other three rows, the leaves of the lateral rows some- 

 what incurved underneath; peduncles terete, glaucous, 50-60 mm. long to 

 the first forking, usually twice forked, the second 8-18 mm. distant from 

 the first, spreading and curving upward; strobiles two, three or usually 

 four, 20-28 mm. long, the sporophylls broadly depressed-ovate, truncate 

 at the base, the lateral margins variously toothed, suddenly contracted 

 into a subulate scarious tip; sporangium reniform, opening by a transverse 

 slit along the top; spores ripening early in August. (L. Chamaecyparissus 

 A. Br.) Differs from L. complanatum, with which it has been confused, 

 in its subterranean habit, its uniform leaves, its method of branching, and 

 in its distant clusters of strobiles. Me. to Ga. and Minn. 



P. 28, after Isoetes lacustris, insert: 



i a. Isoetes heter6spora A. A. Eaton. Submerged with a bilobed 

 trunk. Leaves 50-75, 5-8 cm. long, stiffly erect, tapering to a sharp 

 point, without stomata; sporange spotted with dark cells, co.vered one- 

 third to two- thirds by the velum; macrospores 540-675 / in diameter 

 or even much more densely covered with thick jagged convoluted 

 crests, often reticulate-honeycombed below; microspores about 35X27;*, 

 dark brown, papillose. In ponds, Mt. Desert Island, Me. 



After Isoetes Tuckermani, insert: 



2a. Isoetes hieroglyphica A. A. Eaton. Submerged with a bilobed 

 trunk. Leaves 10-20, 67.5 cm. long, blunt at the apex, without 

 stomata; sporange unspotted, covered one- third by the velum; macro- 

 spores 486-590 fi in diameter, polished, covered with bold vermiform, 

 subconfluent and somewhat reticulated ridges, becoming naked near 

 the equator; microspores 31-44 /* m diameter, distinctly verrucose. 

 St. Francis, Moosehead and Rangeley lakes, Me. 



After Isoetes echinospora Braunii, insert: 



3a. Isoetes Harveyi A. A. Eaton. Submereged, the trunk 2-lobed 

 or occasionally 3-lobed. Leaves 50-140, without stomata, short, 5-6 

 cm., very stout and fleshy, strongly recurved, with an abrupt sharp 

 point, purple-bronze or reddish in drying; sporange small, unspotted, 

 covered one-fourth to one-third with the velum; macrospores 526-648 fi 

 in diameter or rarely larger, with irregular parallel thickish crests above, 

 and reticulate-honeycombed below; microspores 35-40 /* long by 22-30 /* 

 broad, rough. Pushaw Pond, Oldtown, and Long Pond, Mt. Desert, Me. 



P. 29, after Isoetes Canaddnsis, insert: 



8a. Isoetes Gravesii A. A. Eaton. Dioecious or polygamous with 

 submerged or emersed leaves. Leaves 50-75, 12-15 cm. long, erect, 

 sharp-pointed, dark green, with abundant stomata and four bast bundles; 

 sporange oval, cinnamon -colored from the abundant vermiform cells, 

 with only the margins covered by the velum; macrospores small, 351- 

 405 IL in diameter, the upper faces flat, covered with short truncate 

 mostly single columns; microspores rare. Mud flats near outlet of 

 Tyler Pond, Goshen, and gravelly tidal shore, Selden's Cove, Lyme, Conn. 



P. 33, after Pinus rigida, add: 



ii. Pinus serdtina Michx. BLACK PINE. POND PINE. A tree, 

 sometimes 25 m. high, and with a trunk 9 dm. thick, the bark flaky. 

 Leaves in 3*3, glaucous, 15-25 cm. long, the sheaths about 1.5 cm. 

 long; cones lateral, ovoid to globose-ovoid, 4-6 cm. long; scales 

 thickened at the apex, bearing a minute prickle; wing of the seed nearly 

 2 cm. long. In swamps, "S. 6, Va. to Fla. Mar.-April. 



