PLATE 27. 



Odonthalia semicostata (Mertens) J. Agardh. 



46. Habit of a pinnule bearing cystocarps. Such pinnules are always 



more or less eroded. (X 1^) 



47. Portion of a cystoearpic glomerule. {^5) 



48. Portion of a cystoearpic glomerule. ('5) 



49. Portion of a tetrasporic glomerule. (X 10) 



Odonthalia floccosa (Esper) Falkenberg. 



50. Pinna of an antheridial plant, showing the aggregation of the 



antheridial branehlets in a terminal glomerule. ( < 5) 



Odonthalia Lyallii (Harvey) J. Agardh. 



51. Portion of a tetrasporic plant, (nat. size) 



52. Tetrasporic pinnule. (^ 5) 



53. Portion of a cystoearpic pinna. C" 3) 



All the figures were drawn by H. N. Bagley, under the direction of 

 W. A. Setchell. 



L418I 



