1922] 



PFEIFFER — MONOGRAPH OF THE ISOETACEAE 123 



son, Kirk 136 (U. S. Nat. Herb.) ; Lake Guyon, Kirk (Mo. 

 Bot. Gard. Herb.) ; Lake Rotoiti, alt. 1800 ft., January, 

 1881, Cheeseman 56 (N. Y. Bot. Gard. Herb.) ; Lake Rotoiti, 

 alt. 1800 ft., 1 January, 1881, Cheeseman (U. S. Nat. Herb, 

 and Mo. Bot. Gard. Herb.) ; Lake Guyon, 3000 ft., Hector 

 (Gray Herb.) ; Lake Rotoiti, Nelson, January, 1898, Cheese- 

 man (Gray Herb.). 



Kirk's material from Lake Guyon shows rather shorter, stouter 

 habit in the leaves, which do not exceed 17 cm. in any case. 

 Cheeseman's material derived from Lake Rotoiti invariably 

 shows longer leaves, from 25-40 cm., coarse, but appearing more 

 flexuous. Since most of the material is unfortunately lacking in 

 dates, it is impossible to tell whether the difference in size is to 

 be related to seasonal change, ecological factors, or morphological 

 variation. All material is therefore included under the species. 



18. I. Kirkii A. Br. Monatsber. K. Akau. Wiss. Berlin, 2. 1869 ; 

 Kirk, Trans. N. Z. Inst. 2:107 pi. 7. 1875.; Baker, Fern Allies, 

 127. 1887, and Jour. Bot. 18: 69. 1880; Motel. & Vendr. Actes 

 Soc. Linn. Bord. 36: 390. 1883. 



Calamaria Kirkii Kuntze, Rev. Gen. PL 2: 828. 1S91-93. 



Corm 3-lobed; leaves 5-15, 7-13 cm. long, medium slender, 

 rather abruptly attenuate at the tip to a very long fine setaceous 

 apex; stomata rare, even at tip; peripheral strands lacking; 

 ligule short, triangular-ovate; sporangia globose, 2-3 mm. in 

 length, completely covered by velum; megaspores white, 460- 



580 m in diameter, marked on all surfaces with numerous closely 

 set small tubercles, with very slight tendency to confluence on 

 the basal face; microspores small, 17-25 m, smooth. 



Distribution : mountain lakes in New Zealand. 



Specimens examined: 

 New Zealand: Whan gape Lake, Kirk (Mo. Bot. Gard. Herb., 



Gray Herb., and U. S. Nat. Herb.), cotype; Whangape 

 Lake, Hector (Gray Herb.); Lake Tekapo, Canterbury, 

 South Isl., 7 January, 1883, Cheeseman (U. S. Nat. Herb.) ; 

 ponds near Lake Tekapo, Canterbury Alps, alt. 2000 ft., 

 Cheeseman (Mo. Bot. Gard. Herb.) ; Lake Whangape, 1882, 

 ex herb. Martindale (Cheeseman coll?) (Mo. Bot. Gard. 

 Herb.); Lake Whangape, Waikato, N. Isl., Cheeseman (Mo. 



