47 
of the Genus Doassansia, Cornu. 
The views sketched above may be roughly expressed in 
the following diagram : — 
Entyloma 
l 
Cornuella P — D. decipiens group — Burrillia 
i 
Pseudodoassansia — Eudoassansia — Doassansiopsis. 
Cryptogamic Laboratory of Harvard University, Feb. 7, 1891. 
EXPLANATION OF FIGURES IN PLATES 
I AND II. 
Illustrating Mr. Setchell’s paper on Doassansia. 
PLATE I. 
Figs. 1 to 32. Germination of D. alismatis. 
Figs- 33 >, 42 . ,, 
Figs- 43 „ 5 °- „ 
Figs. 51 „ 58. 
Figs. 59 ,, 64. 
All the figures x 1000. 
,, D. obscura. 
„ D. occulta. 
,, D. deformans. 
„ Cornuella lemnae. 
PLATE II. 
Figs. 65 a and 65 A Portion of cross-section of the sorus of D. decipiens. x 650. 
Fig. 66. Portion of cross-section of the sorus of D. epilobii. x 650. 
Fig, 67. „ „ „ „ „ D. hottoniae. x 650. 
Fig. 68. „ „ „ of a leaf of Alisma Plantago , showing two 
sori of D. alismatis. x 1 50. 
Fig. 69. Portion of cross-section of the sorus of D. alismatis. x 650. 
Fig. 70. Tip of hypha of D. alismatis. x 1000. 
Fig. 71. Portion of cross-section of the sorus of D. sagittariae. x 650. 
Fig. 72. Cross-section through a spot of D. opaca on the leaf of Sagittaria 
variabilis. x 87. 
Fig. 73. Portion of side of cross-section of the sorus of D. opaca. x 650. 
Fig. 74. Portion of upper part of cross-section of the sorus of D. opaca. 
x 650. 
Fig. 75. Portion of cross-section of petiole of Sagittaria variabilis, showing 
cross-section of a sorus of D. obscura. x 87. 
Fig. 76. Portion of cross-section of sorus of D. obscura. x 375. 
Fig. 77. Portion of tangential section of the cortex of the sorus of D. obscura. 
x 650. 
