262 Minnesota Algae 



(Pease and Butler). Rocky Bay, Hastings, Barbados. (Vickers). Hawaii. 

 Growing' on other algae. In pools at half tide. Waianae, Waikiki and Laie 

 Point, Oahu. May and June 1900. (Tilden). 



471. Calothrix prolifera Flahault in Bornet and Flahault. Revis. des Nos- 



toc. Ann. Sci. Nat. Bot. VII. 3: 361. 1886. De Toni. Syll. Algar. 



S: 615. 1907. 

 Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 24. no. 1168. 1904. 

 (Calothrix Crustacea forma prolifera (Flah.) Collins). Col- 

 lins. New species, etc., issued in the Phycotheca Boreali-Americana. Rho- 

 dora. 8: 105. 1906. 



Plant mass expanded, velvety, brownish green; filaments 15-18 mic. in 

 diameter, 2 mm. in length, somewhat flexuous, curved and distinctly thick- 

 ened at the base, here and there branched; branches issuing in the region 

 of the heterocyst as in Tolypothrix; sheaths thick, lamellose, firm, colorless 

 in upper portions, yellowish below, ocreate; ocreae dilated and torn; trich- 

 omes 8-12 mic. in diameter, tapering at the apex into a hair; cells three or 

 four times shorter than their diameter; heterocysts one or two at the 

 base, many scattered through the trichome. 



California. Among other algae, on boards wet with salt water. Alameda. 

 January 1904. (Gardner). 



472. Calothrix fasciculata Agardh. Syst. Algar. 71. 1824. Bornet and Fla- 



hault. Revis. des Nostoc. Ann. Sci. Nat. Bot. VII. 3: 361. 1886. 

 De Toni. Syll. Algar. S: 615. 1907. 



Collins. Notes on New England Marine Algae. V. Bull. Torr. Bot. Club. 

 18: 336. 1891. Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 6. no. 

 261. 1897. Collins. Preliminary Lists of New England Plants. — V. Marine 

 Algae. Rhodora. 2: 41. 1900. 



Plant mass caespitose, velvety, expanded, blackish green; filaments 12- 

 21 mic. in diameter, 2-3 mm. in length, erect, somewhat flexuous, a little 

 thickened at the base, when young unbranched, later branched; false 

 branches formed in two ways: sometimes scattered and lateral, solitary or 

 in pairs, sometimes fasciculately crowded on one side of the middle portion 

 of the filament; sheaths moderately thick, lamellose, firm, uniform or di- 

 lated, colorless or with age becoming yellowish brown; trichomes 8-12 mic. 

 in diameter, ending in a hair; cells two or three times shorter than the 

 diameter; heterocysts basal and, in mature filaments, few or numerous 

 throughout the trichome; cell contents blue-green. 



Maine. On rocks between tide marks. Cape Rosier. July 1889; on dead 

 shells. Cape Rosier, July 1895. (Collins). Massachusetts. (Collins). 



Rhode Island. (Collins). 



Forma incrustans Collins. Notes on Algae. — I. Rhodora. i: 13. 1899. 

 De Toni. 1. c. 616. 



Collins. Notes on New England Marine Algae. V. Bull. Torr. Bot. 

 Club. 18: 336. 1891. (C. contarenii Collins). Collins, Holden and 

 Setchell. Phyc. Bor.-Am. Fasc. 12. no. 561. 1899. Collins. Notes on Algae. 

 — II. Rhodora. i: 13. 1900; Preliminary Lists of New England Plants. — V. 

 Marine Algae. Rhodora. 2: 41. 1900. 



