CRYPTOGAMS 



HORSE TAIL AND PILLWOKT 



PLATE XXIV. 



E Q U I S E T U M 

 Figl Fertile Sinn ofF. arvense Fig. Zlertik Stem, ofRrnjaxmami 



Fig. 3 Barren Stem ofJS maocwwrri 



Fig. 6 Longitudinal section of Sporangia 



Shield 



Lowest whorl 

 of Brandies 



winged- thickenings 



Spiral thickenings 



Fibre vascular bundle from Axis 



Leaf Sheath 



Fig. ITortbns of Sporangium wall undei* high power 



cells with spiral thukeriings cell with ringed, thickening* 



Fig.8 Spores under hw power \ 



Fig. 4 LoJigitiuLuial & Transversa 

 section/ of Spik& off. arvense/ . 



Fig. 5 Fertile Leafs tightly enlarged 



Stalked, discs 

 bearing Sporangia 



Fig. 9 Male frothnllus (* 200 ) 



AraheriMa---:::' 



Fig.lO Aranerozoids 





Sporangia, opening 

 on under surface- 



Spore 



i I 



Fig.RYoung Plant ("10) 

 Fig.FA?ich^o7unmajL^Fernlizaiion (*270) 



P I L U L A R I A 

 Fig.14 Transverse section of Fruit 



First Boot 



Macro -spomngiurrL 



Bore 



Fruit 



%eaf sheaths 



Lobe of 



■ProthaSus 



LIFE HISTORY D/AGRAM 



Squisetion. 



TenlizadGerm 



Antheridia. <t 

 Archegonia. 



hdo-gonidia. 



ProtkaSus 

 Male LFemak. 



Fig.15 Microspores 

 irnderbw power 



Fig. 16 Macro spore ("800) 



-"II, 



Inner Coat 

 Hyaline Coat 



Gelatinous Coat 

 with prismatic structure I 



9 Outer Coat 



I with longitudinal and 

 transverse striatiorts ■ A 



' a. v i t y 



Engraved, Printed and Pabnsh.ed'by'W&AX Johnston, Edanbnrgh. 



