376 Proceedings of the Royal Irish Academy. 
Leaves with a short blunt mucro, . . 4. T. aloides. 
aaa. Leaves with nerve naked, and margins revolute. 
Leaves oval-oblong, apiculate, nerve strong, 5. T. atrovieejsts. 
Leaves oblong, lanceolate, . . . . 6. T. eevoltjta. 
Leaves ovate and acuminate, . . .7. T. HonNscnrcHiANA. 
h. Leaves with margins plane. 
Leaves oblong, lanceolate, obtuse, . . 8. T. convoluta. 
Leaves broadly ovate, acuminate, . . 9. T. cukeifolia. 
Leaves rather flaccid, mucronate, . . . 10, T. vahleana. 
Leaves oblong, obtuse, with long hair points, 1 1 . T. muralis. 
hh. Leaves with margins slightly recurved. 
Leaves apiculate or mucronate, . . . 12. T. "DisrGuicuLATA. 
Leaves lanceolate, nerve subexcurrent ; cap- 
sule without annulus, . . . . 13. T. eallax. 
Capsule with annulus, . . . . 14. T. vmEAiis. 
Leaves patent, imbricated, canaliculate, . 15. T. spadicea. 
Leaves spreading, recurved, lanceolate, cari- 
nate, . . . . . . . 16. T. eigiditla. 
Leaves long, narrow, incurved, or uncinate, 17. T. insulai^a. 
Leaves tristichous, much recurved, . . 18. T. eeelexa. 
c. Leaves large, oblong, or spathulate. 
Leaves subspathulate, nerve excurrent, . 19. T. subtjlata. 
Leaves large, obtuse, emarginate, . 20. T. latifolia. 
Leaves with nerve excurrent into a long 
smooth hair-like point, . . . 21. T. l^vipila. 
Leaves with nerve excurrent in a long 
rough hair -like point, . . . 22. T. euealis. 
Leaves oblong, spathulate, carinate, with long 
rough hair- like point, .... 23. T. inteeimedia. 
Leaves with thick, spongy, gemmiparous 
nerve, 24. T. papillosa. 
Leaves nerve excurrent into a short rough 
point, 25. T. peinceps. 
cc. Leaves tortuose and cirrhate. 
Leaves with margins much undulated, . 26. T, toetuosa. 
