232 Minnesota Algae 



Wolle. Fresh- Water Algae U. S. 263. pi. 180. f. 1-3. 1887. Bennett. Plants 

 of Rhode Island. 114. 1888. (Scytonema gracile Kg.). Wolle and 

 Martindale. Algae. Britton's Catalogue of Plants found in New Jersey. Geol. 

 Surv. N. J. 2: 605. 1889. Anderson and Kelsey. Common and Conspicuous 

 Algae of Montana. Bull. Torr. Bot. Club. 18: 144. 1891. Tilden. American 

 Algae. Cent. I. no. 82. 1894; List of Fresh-Water Algae collected in Min- 

 nesota during 1894. Minn. Bot. Studies, i: 236. 1895; American Algae. Cent. 

 V. no. 478. 1901; Collection of Algae from the Hawaiian Islands. Hawaiian 

 Almanac and Annual for 1902. iii. 1901; Algae Collecting in the Hawaiian 

 Islands. Postelsia: The Year Book of the Minnesota Seaside Station, i: 

 153. 1902. Setchell and Gardner. Algae of Northwestern America. Univ. 

 Calif. Pub. Bot. i: 195. 1903. 



Plate XIV. fig. 2-4. 



Plant mass caespitose-floccose or extended in a cushion-like layer, 

 blue-green or brownish; filaments 10-15 mic. in diameter, 1-3. cm. in length, 

 repeatedly branched; false branches erect, spreading, flexuously curved; 

 sheaths membranaceous, thin, here and there inflated at the base of the 

 branches, colorless, rarely yellowish; trichomes 9-12 mic. in diameter, some- 

 times constricted at joints; cells equal to or shorter than the diameter; 

 heterocysts solitary, rarely in twos or threes; cell contents blue-green. 



Alaska. Floating or attached to plants or stones in quiet, fresh water. 

 Cape Nome. (Setchell). Vermont. Pond waters. East Charlotte. (Wolle). 

 Rhode Island. (Thwaites). Warden's Pond. (Wood). North Providence. 

 (Bennett). New York. Reservoir Pond, West Point. (Wood). New 

 Jersey. On rocky shores of Morris Pond, Morris. (Wolle). Wisconsin. 

 Fourth Lake, Madison. (Bailey). Minnesota. Artificial lake. Minneapolis. 

 August 1894. (Tilden). Montana. Everywhere in flowing water, growing 

 caespitose on the rocks. July to October. (Anderson and Kelsey). Wash- 

 ington. Fidalgo Island; Lake Washington, Seattle. (Gardner). Hawaii. 

 Forming tiny bluish green tufts or cushions on rocks in mountain stream. 

 Kaliawaa Stream, Makao, Koolauloa, Oahu. June 1900. (Tilden). 



429. Tolypothrix penicillata (Agardh) Thuret. Essai Class. Nostochinees. 



Ann. Sci. Nat. Bot. VI. i: 380. 1875. Bornet and Thuret. Revis. 



des Nostoc. Ann. Sci. Nat. Bot. VII. 5: 123. 1887. De Toni. Syll. 



Algar. s: 549. 1907. 

 Farlow. Notes on the Cryptogamic Flora of the White Mountains. 

 Appalachia. 3: 236. 1883. Wolle. Fresh-Water Algae U. S. 252. pi. 183. 

 f. 11-13. 1887. (Scytonema naegelii Kg.). Wolle and Martin- 

 dale. Algae. Britton's Catalogue of Plants found in New Jersey. Geol. Surv. 

 N. J. 2: 604. 1889. 



Plate XIV. fig. S. 



Plant mass penicillate-caespitose, deep brown in color; filaments 12-17 

 mic. in diameter, 2 cm. in length, repeatedly branched; false branches erect 

 at the base, flexuously curved, elongate; sheaths firm, membranaceous, at 

 first colorless, afterwards becoming brownish; trichomes about 10 mic. 

 in diameter, cylindrical; cells 4-12 mic. in length; heterocysts usually soli- 

 tary, yellowish; cell contents blue-green. 



