MICROSCOPIC OBJECTS. 40 



Fig. 79. Capsules of the Flowering Fern or King of Ferns 

 (Osmunda regalis) , x 20. 



The spore-cases or capsules of this are entirely different 

 from those of most other Ferns,, being of a subglobose shape 

 and opening vertically. 



The capsules are borne on the fertile fronds in clusters, 

 placed upon stalks. 



Fig. 80. Spores of an Equisetum (Equisetum fluviatile), 



x!20. 



The spores of the Equisetacese are remarkable for their 

 hygrometrical properties, which cause the elaters or curved 

 fibres to curl up when subjected to the influence of moisture. 

 Some of the spores in the drawing will be noticed in the act 

 of curling. In fact they are so sensitive to the least mois- 

 ture, that I doubt not, with observation, this object might 

 be used as a natural barometer. 



The siliceous cuticles of the different species of Equisetum 

 are also good objects, when mounted in balsam, for the pola- 

 riscope. 



The spores are best seen when mounted dry. 



