EXPLANATION OF PLATE XVIII 



Maif/arila inctaHha (Berk. &: Br.) List., p. 237. 

 Fig. \. A group of sporangia, X 15. 

 Fig. 1 a. Oapillitium and spores, X 300. 

 Fig. 1 /;. A single spore, X 1200. 



Didmiia cnr-ntbruin n. s., p. 140. 

 Fig. 2. A group (it sporangia, X 15. 



Didirma astrro'uirs List., p. 143. 

 Fig. 3. Sporangia-spread, X 6. 



Fig. 3 a. Same sporangia still unopened, X 4. 



Comatrulia laxa Host., Of. PI. \'., 5 i^- 5 «, p. 184. 



Fig. 4. Sporangia, X 10. 



D'ldama lyallii (Mass.) Maciir., p. 136. 

 Fig. 5. A group of sporangia, X 10. 

 Fig. 5 a. Oapillitiuin and spores, X 200. 



Lfpiciodnma diaillrtii Rost., p. 146. 

 Fig. 6. A group of sporangia, X 15. 

 Fig. 6 fl. Capillitium and spores, X 150. 

 Fig. 6 h. A single spore, X 800. 



Didyinium tuullus Morg., p. 117. 

 Fig. 7. A group of sporangia, X 10. 



Dldcrma radiatitm Linn., p. 141. 

 Fig. 8. A group of sporangia, X 8. 



Pliysaruni didrrma Rost., p. 55. 

 Fig. 9. A group of sporangia, X 10. 



Didcnna riu/osum (Rex) Macbr., p. 144. 

 Fig. 10. A group of sporangia, X 10. 



Didirina nii'riitn (Rost.) Marhr., p. 137. 

 Fig. 11. A group of sporangia, X 10. 

 Fig. 11 a. Spore and capillitium, X 600. 



Protolr'uliia mrtaHira (Berk.) Mass., p. 258. 

 Fig. 12. A group of sporangia, X 10. 

 Fig. 12 fl. Same; capillitium and spores, X 300. 



Fig. 12 b. Tip of a capillitium thread to show spiral markings and end- 

 fraying, X 800. 



Comatrulia arrjualis Peck, p. 180. 

 Fig. 13. A group of sporangia, X 5. 

 Fig. 1 3 rt. Sporangium tip, capillitium, X 200. 

 Fig. 13 h. Spore, X 800. 



Pliysannn cottiprcssum Alh. & Sclnv., p. 80. 

 Fig. 14. A group of sporangia to show compressed form, X 10. 

 See also Plate XIX., Fig. 12. 



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