EXPLANATION OF PLATE XVI 



Physarcllu oblonga (B. and C.) Morg., p. 71. 

 Fig. i. A group of sporangia, three expanded, x 10. 



Didcnna lyallii (Mass.) Macbr., p. 99. 

 Fig. 2. A cluster of sporangia, x 10. 



Tilinadoche coin pact a Wing., p. 61. 

 Fig. 3. A group of sporangia, one open, j: 10. 



Leocarpiis fnhni s Macbr., p. 82. 

 Fig. 4. A group of sporangia. >: 10. 

 Fig. 4d. Capillitium showing characteristic calcareous nodules, x Soo. 



Didcnna ntgosnin (Rex) Macbr.. p. 105. 

 Fig. 5. A cluster of sporangia, x 10. 



Cratcriitin minimum B. and C., p. 77. 

 Fig. 6. Two sporangia, one closed, x 10. 



Didymium ancllus Morg., p. 85. 



Fig. 7. A cluster of sporangia, >: 10. The pruinose coating of the 

 peridium is not brought out. 



Didyminin complanatiim (Batsch) Rost., p. 85. 

 Fig. 8. Capillitium with characteristic vesicles, x 5. 



I~>idyininin cviininm Peck, p. 92. 

 Fig. 9. Section through the columella, after Morgan. 



Didymium ni^ripes Fries., p. 91. 

 Fig. 10. Section through the sporangium, x 10. 



rtiiailatnm Rost., p. 95. 

 Fig. ii. Sporangia and plasmocliocarps. highly magnified. 



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