OUILLWORT FAMILY 



37 



4. Isoetes bolanderi Engelm. 

 Bolander's Quilhvurt. Fig. 76. 



Isoetes bolanderi Engelm. Am. Xat. 8: 214. 1874. 



Isoetes caiifoniica Engelm. in A. Gray, Man. ed. 5, 677. 1867. 



Isoetes bolanderi var. parryi Engelm. Am. Nat. 8: 214. 1874. 



Isoetes bolanderi var. sonnei Henderson, Bull. Torrey Club 27: 349. 1900. 



Submersed; corm deeply 2-lobed; leaves 6-25, bright green, 

 soft, slender, tapering to a fine point. 6-13 or rarely 25 cm. 

 long: stomata not numerous; peripheral strands usually lacking; 

 ligule small, triangular, cordate ; sporangia 3-4 mm. long, one- 

 fourth to one-third covered by velum; megaspores white, some- 

 times bluish. 300-440 \i, rarely 480 m., in diameter, obscurely or 

 distinctly marked with low tubercles or wrinkles ; microspores 

 23-30 .u long, more or less spinulose. 



Mountain lakes and ponds, Transition and Canadian Zones; Wyoming, 

 Colorado, western Idaho. Utah. .Arizona, Oregon, Washington, California. 

 Type localitv: "in ponds and shallow lakes, Sierra Nevada of California, at 

 altitudes of '5,000-10,000 feet." 



Isoetes bolanderi pygmaea (Englm.) Clute, Fern Allies 228. 1905. 

 (Isoetes pxginaca Engelm. Am. Nat. 8: 214. 1874.) Deeply submersed; 

 corm deeply 2-iobed; leaves 4-15, stout, rather abruptly narrowed at ape.x, 

 2-3 cm. long; stomata and peripheral strands lacking; sporangiurn small, 

 orbicular, with very narrow velum; megaspores white, 360-480 /j, in diameter, 

 smoothish or indistinctly marked with short wrinkles and tubercles; micro- 

 spores 26-30 M- long, smooth to slightly spinulose. Type locality: Mono 

 Pass, Sierra Nevada, California, 7000 ft. altitude. 



5. Isoetes braunii Durieu. 

 Braun's Quillwort. Fig. 77. 



Isoetes braunii Durieu, Bull. Soc. Bot. France 11: 101. 1864. 

 Isoetes echinospora braunii Engelm. in A. Gray, Man. ed. 5, 676. 



1867. 

 Isoetes echinospora boottii Engelm. in A. Gray, Man. ed. 5, 676. 



1867. 

 Isoetes echinospora mitricata Engelm. in A. Gray, Man. ed. 5, 



676. 1867. 

 Isoetes echinospora brittoni Cockerel], Muhlenbergia 3: 9. 1907. 

 Isoetes muricata Durieu, Bull. Soc. Bot. France 11: 101. 1864. 



Submersed or in drier seasons emersed ; corm 2- 

 lobed ; leaves 10-35, straight or recurved, firm, taper- 

 ing to the apex, 8-25 cm. long ; stomata present, usually 

 few, near tip; peripheral strands none; ligule deltoid; 

 sporangia oblong, spotted, 3-5 mm. long, one-half or 

 rarely completely covered by velum ; megaspores white, 

 420-560 fj, in diameter, marked with numerous spines, 

 ranging from slender single spines to those toothed 

 or even confluent in short ridges ; microspores fawn- 

 colored, 23-33 (X long, smooth to slightly roughened on 

 surface. 



In lakes and ponds. Boreal Zones; Labrador, Greenland, eastern Canada, New England, south to New 

 Jersey, Pennsylvania, Ohio, Indiana, Michigan to ^Minnesota; Washington, Idaho, Utah, Colorado. Type 

 locality: "wiers on Lake Winnipiseogee, New. Hampshire." 



6. Isoetes howellii Engelm. 



Howell's Ouilhvort. 



Fig. 78. 



Isoetes howellii Engelm. Trans. St. Louis Acad. Sci. 4: 385. 1882. 

 Isoetes niida Engelm. Trans. St. Louis Acad. Sci. 4: 385. 1882. 

 Isoetes undcrii'oodii Henderson, Bot. Gaz. 23: 124. 1897. 

 Isoetes melanopoda calif ornica A. A. Eaton, in Gilbert, List N. Am. 

 Ptsrid. 27. 1901. 



Amphibious ; corm 2-lobed ; leaves 10-30. rarely 50. bright 

 green, erect or slightly outspread, usually slender, but coarser 

 in emersed forms, 5-25 cm. long; stomata numerous; periph- 

 eral strands usually 4, sometimes one or more lacking; 

 ligule narrow, elongated-triangular ; sporangia frequently 

 brown-spotted, orbicular to oblong, 3-6 mm., rarely 8 mm. 

 long, covered one-third or less by velum ; megaspores white. 

 400-520 \i in diameter, somewhat obscurely marked with 

 simple tulsercles and short crests, these isolated or anastomos- 

 ing, crowded or distant ; microspores 25-33 jx long, smoothish to 

 short-spinulose. 



Border of lakes and ponds. Transition Zone- western Montana, Idaho, 

 Washington. Oregon, California. Type locality: "on the borders of 

 ponds. The Dalles, Oregon." 



