THE GRKKN ALGAE OF NORTH AMKKICA 319 



filaments of more or less torulose cells, branching, cells 6-12 /* 

 diam., 2-3 diam. long; gametangia lageniform to subspherical, 

 lateral or terminal, sessile or pedicelled, 8-12 /* diam., 20 p. long. 

 \Y. I., Cal. Europt\ So. America. 



The peculiar " bottle-shaped " gametangia are the character- 

 istic mark of this species. 



8. T. lorjTHus (L.) Wallroth, 1833, p. 151; Wittr. and 

 Nordst., Alg. Kxsicc., No. 921 ; Hariot, 1889-90, p. 26, fig. 14; 

 Oiroolcpns lolithus Wolle, 1887, p. 122, PI. CXVI, figs. 9-12. 

 Filaments forming a thinner or thicker stratum, color bright 

 red, becoming olive green in drying ; with a distinct and pleas- 

 ant odor of violets; erect filaments straight, torulose, branching, 

 branches curved, apparently dichotomous ; cells swollen at the 

 middle, with constricted nodes, 14-35 /* wide, 24-50 p long; a 

 few cells at the end of the filament or branch often cylindrical 

 and more slender ; membrane thick, with striations and other 

 markings ; gametangia lateral, intercalary or terminal ; spo- 

 rangia round, 20-48 /* diam., or ovoid, 36-40X45-54 /*. Me., 

 Mass., N. H., Alaska, Cal. Europe, Occanica. 



A plant found in all parts of the world, but characteristic of 

 high altitudes or latitudes ; it usually grows on rocks, but 

 occasionally spreads to the mosses also growing on the rocks. 



9. T. ODORATA (Wiggers) Wittrock, 1880, p. 16 ; Hariot, 

 1889-90, p. 29, fig. 16; Chroolcpus odoratum Wolle, 1887, p. 122, 

 PI. CXVI, fig. 6 ; C. umbrinum Wolle, 1887, p. 123, in part, 

 PI. CXVI, figs. 4 and 5. Filaments forming a more or less 

 dense, brownish- to orange-red, sometimes pulverulent or to- 

 mentose stratum, without sharp distinction between horizontal 

 and erect portions, flexuous, with short branches, more or less 

 torulose, cells rounded, ovoid, ellipsoid or almost cylindrical, 

 10-30 p. diam., i-i^-j diam. long ; membrane from thin to thick 

 and lamellate ; gametangia subspherical to ellipsoid, lateral, 

 terminal, or intercalary ; 20-30 /* diam.; sporangia of same size. 

 Canada, Me., N. H., Mass., N. Y., N. J., Fla., Va., St. Vin- 

 cent, Cal. Europe, Asia. 



Var. UMBRINA (Kiitz.) Hariot, 1889-90, p. 36, fig. 17 ; T. um- 

 brina var. querdna, P.'R.-A., No. 662. Filaments irregular 

 and irregularly branched, cells rather loosely united. 



A widely distributed and variable species, including a num- 

 ber of species of various authors. Following Hariot we can 

 distinguish a typical form, with cylindrical filaments mostly 

 straight and parallel, and cells firmly united, and the following 



