Myxophyceae 165 



Minneapolis. December 1896. (Tilden). Iowa. In nodular thickenings on 

 the roots of Cycas revoluta. Greenhouse. Ames. (Buchanan). 



Hawaii. "Sandwich Islands." 1896-97. (Schauinsland). 



311. Nostoc paludosum Kuetzing. Tab. Phyc. 2: i. pi. i. f. 2. 1850. Janc- 



zewski. Observations sur la Reproduction de quelques Nostochi- 

 nees. 'Ann. Sci. Nat. Bot. V. 19: 125. pi. 9. f. B. 1874. Bornet and 

 Flahault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 7: 191. 1888. 

 De Toni. Syll. Algar. 5: 390. 1907. 



Plate VI. fig. 38. 



Lemmermann. Algenfl. Sandwich.-Inseln. 'Bot. Jahrb. 34: 621. 1905. 



Plant mass very minute, scarcely visible to the naked eye, punctiform, 

 gelatinous; filaments loosely flexuous; sheaths wide, bullose; trichomes 

 3-3.5 mic. in diameter; cells barrel-shaped, ' equal in length to the diame- 

 ter; heterocysts a little larger than the vegetative cells, light-colored; go- 

 nidia 4-4.5 mic. in diameter, 6-8 mic. in length, oval, 'blue-green, with a 

 very thin, smooth, transparent outer membrane. 



Hawaii. In ditches and pools between Honolulu and ' Waikiki, Oahu. 

 1896-97. (Schauinsland). 



312. Nostoc aureum Kuetzing. Tab. Phyc. 2: i. pi. i. f. 4. 1850. De Toni. 



Syll. Algar. 5: 391. 1907. 



Dickie. On the Algae found during the Arctic Expedition. Journ. 

 Linn. Soc. Bot. 17: 9. 1880. 



Colonies small, adherent, somewhat globose, orange or green, soft, 

 somewhat elastic, mucous within; trichomes 2-2.5 niic. in diameter, very 

 short, strongly curved, loosely entangled, sometimes nearly straight; cells 

 sometimes crowded, sometimes separated, often continuous, somewhat 

 globose or oblong, blue-green; heterocysts 3-4.5 mic. in diameter, spherical, 

 single and scattered or in series. 



Arctic Regions. Among mud from Floeberg, 82° 27' N. (Moss). "It 

 must have been conveyed by currents from the land, or blown off shore 

 with dust from a dried-up pool." — Dickie. 



313. Nostoc comminutum Kuetzing. Tab. Phyc. 2: 3. pi. 10. f. 2. 1850. De 



Toni. Syll. Algar. 5: 393. 1908. 



WoUe. Fresh-Water Algae U. S. 282. 1887. Harvey. The Fresh- 

 Water Algae of Maine.— I. Bull. Torr. Bot. Club. 15: 161. 1888. Britton. 

 Catalogue of Plants found in New Jersey. Geol. Surv. N. J. 2: 606. 1889. 



Plant mass small, gelatinous-membranaceous, soft, sometimes green 

 or blue-green, sometimes becoming dull brownish; trichomes 3-4 mic. in 

 diameter, fiexuously curved, somewhat densely entangled; cells spherical 

 or depressed spherical, strongly compressed, closely or loosely connected; 

 heterocysts exactly spherical, up to twice the diameter of the cells, inter- 

 calary, rarely terminal; cell contents homogeneous, pale blue-green. 



United States. Floating in ditches and smaller ponds. (Wolle). Maine. 

 Abundant in a gathering made from a pool in the Penobscot at Great 

 Works. (Merrill). New Jersey. On pond waters, frequent. (Wolle). 



