PLATE III. 



Fig. 1. — Mature pycnidia, showing a few unicellular hyaline spores and orifire from which they 

 have been expelled. 



Fig. 2. — Xearly mature pycnidia, with attached AHcrnaria spores. 



Fig. 3. — Mycelium threads giving rise to Alternaria spores and an immature iiycnidium. 



Fig. 4. — Common type oi AUernaria. 



Fig. 5. — Conidial form of Cladosporium developed from microsclcrotia found on gummy excre- 

 tions. 



All from camera lucida drawings. 



