DESCRIPTION OF PLATES. Ill 



Plate VII. Fungi from various hosts. Fig. 1.— Asci and spores of Dimero- 

 sporium parkinsoniae Heald and Wolf on retama (Parkinsonia aculeata L.). 

 Fig. 2. — Three forms of conidiospores of D. parkinsoniae Heald and Wolf. 

 Fig. 3. — Section through a conidial tuft of Cercospora kaki Ell. and Ev. 

 on persimmon {Diospyros kaki L.). Fig. 4.— Conidiophores and conidia of 

 Clasterosporium diffusum Heald and Wolf on pecan {Hicoria pecan 

 (Marsh.) Britt). Fig. 5. — Section through a sporodochium of Exosporium 

 concentricum Heald and Wolf on Euonymus japonicus Thunb. Fig. 6. — 

 Conidiophores of Helminthosporium giganteum, Heald and Wolf on Ber- 

 muda grass (Capriola dactylon (L.) Kuntze). Fig. 7. — One of the spores of 

 H. giganteum Heald and Wolf on Bermuda grass (C. dactylon (L.) Kuntze). 

 Fig. 8. — Section through an acervulus of Cercosporella mori Pk., showing 

 the conidiophores and conidia on mulberry (Morus alba L.). 



Plate VIII. Fig. 1. — Leaflet of the date palm (Phoenix dactylifera L.), showing 

 numerous pustules of Graphiola phoenicis (Moug.) Poit. Fig. 2. — Leaf of 

 grape (upper surface), showing numerous dark blotches due to Cercospora 

 viticola (Ces.) Sacc. Fig. 3. — Bacterial twig-canker of the plum 

 (Prunus sp.). 



Plate IX. Fig. 1. — The roots of a tomato plant (Lycopersicon esculentum 

 Mill.) deformed by nematodes (Heterodera radicicola (Greef) Miil.). 

 Fig. 2. — Root-knot of muskmelon (Cucumis melo L.) due to Heterodera 

 radicicola (Greef) Miil. Fig. 3. — Leaves of the Lima bean (Phaseolus 

 lunatus L.) affected with leaf-spot due to Cercospora canescens Ell. and 

 Martin. 



Plate X. Fig. 1. — Young watermelons (Citrullus vulgaris Schrad.) affected 

 with blossom-end blight and rot. Fig. 2. — Potato {Solatium tuberosum L.) 

 with nodules formed by Rhizoctonia. Fig. 3. — A young cymling (Cucur- 

 bita pepo L.) almost destroyed by Botrytis cinerea P. 



Plate XL Fig. 1. — Balansia hypoxylon (Pk.) Atk. on the inflorescence of feather 

 grass (Stipa leucotricha Trim). Fig. 2. — Portion of a leaf of sorghum 

 (Andropogon sorghum (L.) Brot.) affected with blight due to Collet otrichum 

 lineola Cda. Fig. 3. — Roots of cotton (Oossypium herbaceum L.) affected 

 with root-rot due to a new species of sterile fungus. 



Plate XII. Fig. 1. — Leaves of Euonymus japonicus Thunb., showing the char- 

 acteristic spotting caused by Exosporium concentricum Heald and Wolf. 

 Fig. 2. — Leaves of E. japonicus Thunb., showing spots due to Colletotrichum 

 griseum Heald and Wolf. 



Plate XIII. Fig. 1. — Leaf of winged elm (Ulmus alata Michx.) affected with 

 scab due to Gnomonia ulmea (S.) Thm. Fig. 2. — Leaf of red mulberry 

 (Morus rubra L.), showing eye-spot due to Cercospora moricola Cke. 

 Fig. 3. — Tar-spot on the live oak (Quercus virginiana Mill.) due to Rhytisma 

 erythrosporum B. and C. Fig. 4. — Leaflets of black locust (Robvnia pseuda- 

 cacia L.), showing the characteristic spotting due to (Cylindrosporium 

 solitarium Heald and Wolf. 



Plate XIV. Fig. 1. — Leaves of the hackberry (Celtis laevigata Willd.), 

 blighted by Cylindrosporium defoliatum Heald and Wolf. Fig. 2. — Leaf of 

 the sycamore (Platanus occidentalis L.), blighted by Phleospora multi- 

 maculans Heald and Wolf. 



Plate XV. Fig. 1. — Leaf of the Japanese privet (Ligustrum japonicum Thunb.) 

 affected with leaf-spot caused by Cercospora ligustri Roum. Fig. 2.— 

 Small branch of mesquite (Prosopis glandulosa Torr.), showing three galls 

 of possible bacterial origin. Fig. 3. — A single large gall on a small branch 

 of mesquite. 

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