. Fungous diseases of plants, with chapters on physiology, culture methods and technique . in Europe and Asia. Whenpotato vines are affected there is ablackening of the fibrovascular sys-tem of the tuber, and eventually ablack rot may set in. The organismis aerobic and an alkaline reactionis produced. No gas is evolved,and gelatin is not, or only very Fig. 40. Subculture of Bacillus slightly, liquefied. Recently it hasARoiDE^o^ Agar Slant. (Photo- ^^^^ ^^^^^ ^^^^ ^j^.^ ^3^, duces also the Granville tobacco wilt. KJ I o graph by C. O. Townsend) XV. BACILLUS: OTHER SPECIES Among other disease-pr
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . in Europe and Asia. Whenpotato vines are affected there is ablackening of the fibrovascular sys-tem of the tuber, and eventually ablack rot may set in. The organismis aerobic and an alkaline reactionis produced. No gas is evolved,and gelatin is not, or only very Fig. 40. Subculture of Bacillus slightly, liquefied. Recently it hasARoiDE^o^ Agar Slant. (Photo- ^^^^ ^^^^^ ^^^^ ^j^.^ ^3^, duces also the Granville tobacco wilt. KJ I o graph by C. O. Townsend) XV. BACILLUS: OTHER SPECIES Among other disease-producing organisms of this genus maybe mentioned the following: Bacillus Hyacifithi-septiciis Heinz,^ causing rapid death of cul-tivated hyacinths. Bacillus Cubo7iiaitus Macch.,^ said to be the cause of animportant leaf and twig disease of the mulberry, especially inFrance and Italy. 1 Heinz, A. Zur Kenntniss der Rotzkrankheiten der Pflanzen. Centrbl. u. Parasitenk. 6 : 535-539. 1889. 2 Macchiati, L. Sulla biologia delB^il^sCubonianus, sp, nov. Malpighia 6289-301. //. 21. CHAPTER X PHYCOMYCETES The Phycomycetes are commonly called the algal-like are very diverse both with reference to the characteristicsof the vegetative and of the reproductive stages. The habits ofthese forms, moreover, are so varied that a discussion of suchpeculiarities may be postponed until the individual families aredescribed. The lower forms show very little differentiation orcomplexity of vegetative parts, and the fungous body may indeedconsist of a single simple cell. In other forms the fungous bodypossesses short branches or thread-like parts, which may be desig-nated hyphcE. In the higher forms there is a well-developed my-celium, or system of branching hyphae. These vegetative hyphaeare commonly siphonaceous (nonseptate), but sometimes crosswalls (septa) are produced. In fact, there are families in whichthe mycelium is constantly siphonaceous until the reproductivecells are
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