318 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



but sometimes terminal ; sporangia on special cells, spherical 

 or slightly ovoid, 12-20 /A diam. Canada, N. H., Vt. Europe. 



A northern species growing usually on coniferous trees, but 

 it has been found on oaks in Europe. It is like the smallest 

 forms of T. a urea, but the filaments are more delicate and flexu- 

 ous ; the gametangia are smaller, and are liable to be found 

 anywhere on either erect or basal filaments. 



4. T. EFFUSA (Krempelhiiber) Hariot, 1889-90, p. 52, figs. 

 12 and 13; T. setifera P. B.-A., No. 117. Forming yellowish- 

 brown patches, becoming whitish when dry ; filaments of basal 

 layer cylindrical or more or less torulose ; erect filaments 120- 

 300 /A high, 6-10 /x diam. at the base, tapering to a point, usu- 

 ally simple, but sometimes branched ; cells 18-28 yu, long ; game- 

 tangia developed from cells of the basal layer or lowest cells of 

 the erect filaments, spherical or ovoid, 16-20X22-30^. Conn. 



Asia, So. America. 



The tapering filaments seem to indicate a connection between 

 this genus and the Chaetophoraceae ; we have no species for 

 w r hich it is liable to be mistaken. 



5. T. ARBORUM (Ag.) Hariot, 1889-90, p. 20, figs. 8 and 9 ; 

 P. B.-A., No. 1522. Filaments tufted, elongate, branching, 

 somewhat attenuate ; branches usually patent and somewhat 

 more slender than the main filament; cells 16-28 ^ diam., 40- 

 60 n long ; gametangia usually terminal ; sporangia 2-7 to- 

 gether, the branch terminating in a swollen cell, on which are 

 borne several nearly empty curved cells, each bearing a spo- 

 rangium, spherical or ellipsoid, 18-24X24-32 p. Jamaica, 

 Guadeloupe. Asia, So. America, Australia. 



The vegetative filaments resemble T. aurea, but the arrange- 

 ment of the sporangia is characteristic. 



6. T. WAINOI Hariot, 1889-90, p. 19, figs. 6 and 7 ; P. B.-A., 

 No. 1523. Tufts yellow-green, about ^2 cm. high; filaments 

 cylindrical, 16-28 /j. diam., cells 2-4 diam. long, wall smooth and 

 rather thin, branches more or less abundant, irregularly placed, 

 terminal cell slightly attenuate. Gametangia (?) spherical, 28- 

 40 /x diam., in more or less close series along the filaments; 

 zoosporangia (?) about 12 /x diam., borne terminally on short, 

 lateral cells, or on the terminal cells of branches arising from 

 this cell. Fig. 117. California, Jamaica. So. America. 



7. T. LAGENIFERA (Hildebrandt) Wille, 1887, p. 427 ; P. 

 B.-A., No. 1470; Chroolepus lageniferum Rabenhorst, 1868, p. 

 373, fig. 104. Frond orange to crimson; both basal and erect 



