no MICROSCOPICAL RESEARCH 



PLATE XX. 



CELL STRUCTUEE AND CELL CONTENTS. 



Fig. 70. Transverse section. Leaf of Thistle. ' Carduus lanceolatus,' 

 afEected with uredospores of 'Puccinia graminis' x 70 dia. 

 Fixed with 92% Alcohol. (Unstained.) 1. disorganised 

 tissue of leaf. 2. Mycelium of fungus. 3. Uredospores 

 on under side of leaf. 4. Disorganised palisade layer. 



Fig. 71. Transverse section. Stem of Wheat affected with 'teleuto- 

 spores ' of ' Puccinia graminis ' x 70 dia. Fixed with 92% 

 Alcohol. (Unstained.) 1. Disorganised tissue of stem. 



2. Mycelium of fungus. 3. Inner layer of hollow stem. 

 4. Vascular bundle in normal condition. 5. Teleuto-spores. 



Fig. 72. Transverse section. Leaf of Berbery. 'Berberis vulgaris,' 

 afEected with secidiaspores of ' Puccinia graminis ' x 36 dia. 

 Fixed with 92% Alcohol. (Unstained.) 1. Ground tissue 

 of leaf. 2. Palisade layer. 3. Mycelium of fungus. 

 4. Fully-developed secidium. 5. Spermogone of unknown 

 function. 



Fig. 73. Vertical section through entire plant of ' Peziza convexula ' 

 X 60 dia. Fixed with 92% Alcohol. Stained with Aniline- 

 Picrate and Gossypimine. 1. Thallus. 2. Sterile tissue. 



3. Ascospores in various stages of development. 4. Para- 

 physes. 5. Upper convex surface of plant. 



