 THALLOGENS. _ tee FUNGALS. 
Botrytis. Micheli. 
Mieroseopic. Consisting of erect branched threads, at the ends of which grow 
clusters of spores (spore-cases. ) 
1. B. infestans Montagne.—(Potato Muit- 
pew.) Fig. 21. 
Tufts of threads, lax, erect, white, branch- 
ing at the ends; spores lateral and 
terminal, solitary, oblong, with a gra- 
nular nucleus. 
Habitat. Leaves of the common Potato. 
Quality. Attacks the leaves and stems, and aggra- 
vates the disease to which this plant has 
become subject. 
2. B. Bassiana Montagne.—(SiLkworm- 
Rot. Muscarpine.) Fig. 25. 
Threads erect, branched in a racemose 
manner, with clusters of spores at the 
end of the short lateral divisions. 
Quality, Kills silkworms in great numbers. 
Orium. Link. 
Microscopic. Threads white or brightly coloured, simple or irregularly 
branched, moniliform above, and breaking up into more or less elliptic 
spores.— Berkel. MSS. 
1. 0. abortifaciens Berkel. LErgotetia abortifaciens Quekett (Hrgot.) 
Threads white, irregularly branch- 
ed ; spores abundant, elliptic, 
containing two nuclei, — 
Berkeley. 
Habitat, Ovary of Grasses and Eleo- 
charis, causing the disease called 
Ergot, destroying the ordinary 
growth, and compelling it to assume 
a horned appearance. 
Quality. The ovary thus affected 
becomes hardened and deformed. 
Uses. Ergot or spurred Rye is 4 
dangerous narcotic poison, produc- 
ing gangrene. Used in medicine to 
increase the action of the uterus in 
difficult parturition. 
2. 0. Tuckeri Berkeley.—(Vin 
Muew.) Fig. 26. : 
Fertile threads elongated ; spores 
vree, elliptic or oblong, at 
i ength septate,— a 
_ Habitat. Leaves and green parts of Vines, “Athen pote pa aes 
a Quality. A formidable parasite, destroying the functions of the skin of the parts it 
attacks, 
__ Fig. 25.—Magnified view of Botrytis Bassiana ; 26. Do. of Oidium Tuckeri. ata by 
the stomates of a Vine leaf; b, a plant, with mycelium 3 ¢, Spores ; d, idium of teenth wont aed. 
