Isoetes. | ISOETACES. 1043 
1. I. Kirkii, A. Brawn in Berl. Monatber., July, 1869.—Per- 
manently submerged. Stem short, tuberous, deeply 3-lobed ; roots 
numerous. Leaves 10-30, very slender, 3-12 in. long, about #4, in. 
diam., tapering to a fine point, pale-green, diaphanous, usually 
with a few stomata, but with no accessory bast-bundles. Sporangia 
rather small, broadly oblong or almost globose, about fin. long; 
indusium complete. Macrospores rather small, chalky-white, beset 
all over with small unequal tubercles. Microspores very minute, 
trigonous, most minutely punctate.—Kirk im Trans. N.Z. Inst. ii. 
(1870) 107, t. 7; Bak. Fern Allies, 127; Thoms. N.Z. Ferns, 109. 
Nort Istanp: Wairua River, A. Thompson ! lakes in the Middle Waikato 
Basin, abundant, Kirk! T. F.C.; Lake Rotokakahi, Kirk! Lake Taupo, 
‘C. J. Norton! SourH Isutanp: Small lakes near Lake Tekapo, 7. F’. C. Sea- 
level to 2500 ft. 
Best distinguished from the following species by its smaller size and more 
slender habit, fewer leaves, and particularly by the conspicuously tubercled 
‘macrospores. 
2. I. alpinus, 7. Kirk in Trans. N.Z. Inst. vii. (1875) 377, 
t. 25.—Permanently submerged; much larger and stouter than 
I. Kirkw. Stem stout, deeply 3-lobed. Leaves very numerous, 
30-70, 6-18 in. long or even more, ;-;4,in. broad at the middle, 
much dilated at the base, gradually tapering to the apex, dark- 
green, diaphanous, usually with a few stomata, but with no 
accessory bast-bundles. Sporangia oblong, 4—-1in. long; indusium 
complete. Macrospores greyish-white, smooth or very indistinctly 
tubercled. — Bak. Fern Allies, 127; VYhoms. N.Z. Ferns, 109. 
(?)I. multiangularis, Col. in Trans. N.Z. Inst. xxii. (1890) 449. 
NortH Istanp: Lake Taupo, C. J. Norton. SoutH Istanp: Not un- 
common in lakes in mountain districts, from Nelson to the south of Otago. 
1200-3000 ft. 
