116 PATHOLOGY [Bot. Absts. 



786. Sharples, A. The laticiferous system of Hevea brasiliensis and its protective func- 

 tion. Ann. Bot. 32: 247-251. 1918— See Bot. Absts. 1, Entry 1409. 



787. Shinbo, Ippo. Beitrage zur Kenntniss einiger einheimischen Pflanzengallen in 

 Japan. [A Japanese plant gall.] Bot. Mag. Tokyo 33: 1-12. 3 fig. 1919. 



788. Stakman, E. C. Destroy the common barberry. U. S. Dept. Agric. Farmers' 

 Bull. 1058. 11 p., 6 fig. 1919. 



789. Stakman, E. C. Banish the barberry and save the wheat. Amer. Assoc. Nursery- 

 men Ann. Conv. 43: 41-46. 1918. 



790. Stevens, Frank Lincoln. An apple canker due to Cytospora. Illinois Agric. 

 Exp. Sta. Bull. 217: 367-379. 1 pi., 15 fig. 1919.— The disease was found on the main trunk 

 of a young apple tree, the diseased area, 22 cm. wide, encircling the tree trunk. The fungus 

 appeared as small black pustules under, or erumpent through the cuticle. Under the micro- 

 scope these proved to be compound pycnidia. No ascigerous structures were found. The 

 method of isolation is described. Artificial inoculations in test tubes of apple and other twigs 

 with the pure culture proved successful. Though the fungus here discussed agrees well with 

 Cytospora of Valsa leucostoma, it is best to defer final judgment as to its specific name. — 

 M. J. Prucha. 



791. Stevens, F. L., and Esther Y. True. Black spot of onion sets. Illinois Agric. 

 Exp. Sta. Bull. 220: 507-532. Fig. 1-19. 1919. — The disease causes serious losses, appearing 

 on onions during storage, particularly on onion sets of white varieties. Several fungi were 

 found present on the diseased specimens, the so-called Vermicular ia being present in 60 to 80 

 per cent of onion sets examined. — The disease has been found in many states. It assumes 

 three distinctly different types. The most common type appears as a nearly black spot, 

 about 1 cm. in diameter, on the dry outer scales of the bulb. In this spot numerous black 

 knots of mycelium are seen. They are typical sporodochia and the new combination Volutella 

 circinans is proposed. The mycelium is 3.6 to 10.8 m in diameter, irregularly branched and cut 

 by septa at irregular intervals. Perithecia were found in organic connection with mycelium 

 recognizable as that of the fungus causing the disease. A new genus, Cleistolhecopsis, is 

 proposed for the fungus, the chief difference from Cleistotheca being that conidial stages are 

 unlike. — The rapid drying of the onion sets is emphasized as the preventive measure. — M . J. 

 Prucha. 



792. Stevens, Frank Lincoln. Two Illinois rhubarb diseases. Illinois Agric. Exp. 

 Sta. Bull. 213: 299-312. Fig. 1-19. 1919. — Anthracnose is due to Colletotrichum erumpens. 

 The disease was found in several Illinois counties. It consists of a soft rot of the petioles; 

 the diseased spots usually are soft, watery, and oval. When these spots attain a length of 

 somewhat more than a centimeter, acervuli appear abundantly in the centers of the spots. 

 The acervuli begin subcuticularly as an aggregate of hyphae which soon rupture the cuticle. 

 Soon after this, the setae appear and spores begin to form. The fungus is readily isolated; 

 its cultural characters are described, and its taxonomy is discussed. — Rhubarb leaf spot is 

 due to Phyllosticta straminella. It mainly affects the leaf blade, forming irregularly circular 

 dead spots from a few to several centimeters in diameter. Close inspection shows numerous 

 very minute dark pycnidia. The microscope reveals the presence of a pycnidial fungus of 

 the Phoma or Phyllosticta type. Spores issue in cirrhi. Cultural characters and taxonomy 

 are given. — M. J. Prucha. 



793. Tanaka, Ty6zabur6. New Japanese fungi. Notes and translations. VI. Mycolo- 

 gia 11: 80-86. 1919.— See Bot. Absts. 3, Entry 730. 



794. Tanaka, Tt6zabur6. New Japanese fungi.— Notes and translations. VII. 

 Mycologia 11: 148-154. 1919.— See Bot. Absts. 3, Entry 731. 



