Apr. IS, i9i8 A Leafblight of Kalmia latifolia 211 



undoubtedly be placed from the characters given is Phomopsis, it is 

 believed that the name "Phomopsis kalmiae" is a suitable one. 



Phomopsis kalmiae, n. sp. 



Pycnidiis in foliis et caulibus kalmiae latifoliae subglobosis, epidermide tectis, 

 sparsis, sine stromate, fuscis, carbonaceis, ostiolatis, pleunimque unilocularibus. 

 Pycnidiis in culturis subglobosis, vel saepe late ellipsoideis, non definite ostiolatis, 

 plurilocularibus, sparsis, gregariis, vel in stromate aliquid denso, atro-viridibus, 

 carbonaceis. 



Sporulis ovatis, ellipsoideis, raro subfusoideis, continuis, hyalinis, typice 2-guttu- 

 latis, 1.8-3.6 X 5.5-8.8 M- Basidiis filiformibus, pleurumque continuis, hyalinis, 

 obtusis, 0.5-2 X 9-20 IX. Scolecosporulis filiformibus, attenuatis, fusoideis, rectis, vel 

 leviter curvulis, vel hamatis, raro sigmoideis, saepe guttulatis, 1.6-2.4 X 14-33.6 n. 

 Basidiis brevibus, hyalinis, continuis, subulatis, 2.2-2.7 X 5.5-11.1 m- 



Pycnidiain leaves and stems scattered, subepidermal, brown, carbonaceous, usually 

 unilocular, subglobose, without stroma, ostiolate. Pycnidia in culture media 

 scattered, aggregate or in a rather thick stroma, subglobose to broadly elliptical, 

 plurilocular, without definite ostiole. 



Spores oval, ellipsoidal or rarely subfusoid, with two to several oil drops, continuous, 

 hyalin, measuring 5.5 to 8.8 by i.8t03.6 /i. Basidia filiform , tapering to blunt points, 

 continuous, hyalin. Scolecospores filiform, attenuate, spindle-shaped and straight or 

 slightly curved, or hooked and attenuate, occasionally delicately S-shaped, hyalin, 

 continuous, and often contain one to several oil drops, measuring i .6to 2.4by I4t0 33.6 ju. 

 Basidia short, hyalin, continuous, subulate, 2.2 to 2.7 by 5.5 to 11. i /x. 



SUMMARY 



The leafblight of Kalmia latifolia is characterized by a blight or dryrot 

 involving large areas of either the leaf blade or the entire leaf. Later, it 

 extends through the petioles into the stems and may eventually kill the 

 entire plant. A fungus has been isolated whose parasitism has been 

 demonstrated by successful inoculations into healthy plants. No pub- 

 lished information upon this disease has been found, and the casual 

 fungus is therefore described as a nev^ species: Phomopsis kalmiae. • 



Pycnidia are readily produced on diseased leaves placed in damp 

 chambers. Sclerotia-like bodies and pycnidia are produced in large 

 numbers in most of the ordinary culture media. The sterile bodies are 

 undoubtedly potential pycnidia as shown by the production of pycno- 

 spores after transplanting portions to fresh culture media. 



LITERATURE CITED 



(i) 1870. NiTscHKE, Theodor. 



PYRENOMYCETES GERMANici . . . Bd. I, Lfg. 2. Brcslau. 



(2) 1909. Reddick, Donald. 



NECROSIS OF THE GRAPE VINE. N. Y. Comell Agr. Exp. Sta. Bui. 263, 



P- 323-343. fig- 41-57- 1909- 



(3) 19 II. DiEDECKE, Herman. 



DIE GATTUNG PHOMOPSIS. In Ann. Mycol., v. 9, no. i, p. 8-35, pi. 1-3. 



(4) 1911. Fawcett, H. S. 



STEM-END ROT OF CITRUS FRUITS. Fla. AgT. Exp. Sta. Bul. 107, 23 p., 



9 fig- 



