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



that the figures given by Wolle for Oe. echinatum seem to Hirn 

 to be more like Oe. armigeruin, which was undescribed at the 

 time Wolle's book was published, than like Oe. echinatum. 

 They are much more complete than Wood's figures, but Wolle 

 does not give the localit} 7 of the plant from which they were 

 made. 



49. OE. ECHINATUM (Wood) Wittrock, iSySa, p. 137 ; Hirn, 

 1900, p. 204; Androgynia cchinata Wood, 1872, p. 198, PI. 

 XVIII, fig. 3. Dioecious, nannandrous ; oogonia single, glo- 

 bose, usually depressed, pore superior ; oospore same form as 

 the oogonium, nearly filling it, epispore with narrowly conical 

 spines ; dwarf males nearly straight, near the oogonia. 



veg. cell, 8-12 M diam., 6-14 diam. long. 



oog., 35-36 M " 



oos., 25-26 /j. " 25-26 fj. long. 



Pa. 



A quite imperfectly known species; see notes under Oe. 

 arm igcrnm. 



50. OE. STELLATUM Wittrock, 1870, p. 129 ; Wolle, 1887, 

 p. 85, PI. LXXXIV, figs, i and 2; Hirn, 1900, p. 205, PI. 

 XXXIV, fig. 210. Dioecious, nannandrous, gynandrosporous ; 

 oogonia single or 2-3, oboviform-globose, pore superior ; oospore 

 globose, about filling the oogouium, epispore with conical 

 spines, arranged in 4-7 occasionally anastomosing spirals, sufful- 

 tory cell hardly swollen ; androsporangia i-3-celled, generally 

 subepigynous ; basal cell elongate, terminal cell slender, hya- 

 line, obtuse ; dwarf males nearly straight, on the suffultory 

 cells, antheridium exterior, i-2-celled. 



veg. cell, 15-35 M diam., 3-6 diam. long. 



oog., 51-64 /x " 56-70 M long. 



oos., 50-58 M " 50-58 M " 



andr. cell, 14-19 M " 13-20 M " 



nan. stipe, 11-13-" " 45'52 M " 



anth. cell, 6-9 /x " 8-13 M " 



Florida. Europe, Africa, Australia, So. America. 



From the previously noted species with spinous spores this is 

 distinguished by the spiral arrangement of the spines, which 

 are also stouter and relatively shorter than in the species before 

 mentioned. These characters it shares with Oe. Donnellii, which 

 is, however, a larger plant in every way. The great variation 

 in the diameter of the vegetative cells in the same filament is a 

 noticeable character of this species. 



