24 Bulletin 313 



Fabraea maculata (Lev.) Atk. (= Entomosporium maculatum 

 Lev., page 94) . 



Rhytisma acerinum (Pers.) Fr. (= Melasmia acerina Lev., 

 page 94). — On the leaves of the maple. Causes the so-called tar 

 spots which are at first yellow, becoming thick and black. The 

 conidiophores are short; conidia numerous, small, hyaline and 

 1-celled; the apothecia ripen in the spring; they are arranged radi- 

 ally; the asci are 120-130 x 9-10 fx. and the spores 65-80 x 1.5-3 /i.; 

 the paraphyses numerous and incurved or hooked. 



78. Infected leaf of maple. 79. Cross-section of apothecia showing asci, 

 2/3. 80. Ascus, 1/12. 81. Ascospores, 1/12. 



LoPHODERMiUM BRACHYSPORUM Rost. — On the leaves of the pine. 

 Asci cylindric, short-stalked, roimded apex, 120-20 x 25 /*, 8-spore; 

 paraphyses bacillar with apices curved ; spores oblong, hyaline, 

 28-30 X 9-10 IX. 



82. Infected needle of Pinus excelsa. 83. Cross-section of perithecium, 

 2/3. 84. Ascus and paraphyses, 1/6. 85. Ascus, 1/12. 86. Ascospores, 1/12. 



LoPHODERMiUM piNASTRi (Schr.) Chcv. — On pine needles, caus- 

 ing them to fall; conidia (formed the first year) are cylindrical, 

 hyaline, continuous, 6-8 x 1 /*. The ascocarps, formed the second 

 year) are scattered, black, 1 mm. or less in length; asci somewhat 

 clavate and 8-spored ; ascospores cylindrical, nearly as long as the 

 ascus, 90-120 x 1.5 yu,; paraphyses long, slender, and with curved 

 tips. 



87. Asci containing spores, 1/12. 88. Paraphyses, 1/12. 



Thielavia basicola (B. & Br.) Zopf. — On the roots of alfalfa, 

 sweet pea, horse-radish and other plants. Causes a root rot. Co- 

 nidia hyaline, 10-20 x 4-5 /a; chlamydospores in chains separating, 

 short cylindrical, 5-8 x \2 p.; perithecia, 80-100 /x; asci ovate; asco- 

 spores non-septate, chocolate-colored. 



89. Root of alfalfa showing cankers. 90. Mycelium, 1/6. 91. Chlamydo- 

 spores, 1/12. 



