192 
MILDEWS, RUSTS AND SMUTS 
Ustilago vaillantii, Tiil. 
Spore-masses produced in the anthers, less fiequently 
in the ■ ovary, olive-brown then black, soon powdery; 
spores irregularly globose, oblong or elliptical, wall yellowish- 
brown, smooth or minutely granulated, 7—15 X 8—12 p ; 
promycelium spindle-shaped, 1-3-septate, promycelium 
spores spindle-shaped, borne singly at the septa and at 
the tip. 
On Scilia hifolia, Gagea lutea. 
Not at all uncommon in gardens on Scilla hifolia. The 
mycelium of the fungus is perennial in the stem or “ cus¬ 
hion ” of the bulb, where it forms very conspicuous 
haustoria. This mycelium grows up each year with the 
flowering stem. 
‘ 'Italy, Germany, Austria, Hungary, and N. Africa. 
" B. Spores produced on the leaves, stem or culm. 
Ustilago'gfandis, Fries ; Plowr., Ured., p. 275. 
Forming' long streaks on the culms beneath the leaf- 
sheaths, soon becoming black and powdery ; spores angu¬ 
larly globose or elongated, wall smooth, yellowish-brown, 
6 —8 p, or 8—14 X 6 —9 p ; promycelium cylindrical, 
indistinctly 2—3-septate; promycelium spores terminal 
and lateral, elliptic spindle-shaped, stalked. 
Syn. Ustilago typhoides, Berk, and Broome. 
On Phragmmites comunis, Typha latifolia, and T. minor. 
Germany, Belgium, Finland, and Hungary. 
Ustilago longissima, Tul, ; Plowr., Ured., p. 272. 
Forming very long brown streaks on the leaves, mostly 
on the upper side, which soon become powdery ; spores 
globose or elliptical, pale olive-brown, smooth, 4—8 p ; 
promycelium spindle-shaped, narrowed at the base ; 
promycelium spores spindle-shaped. 
Syn. Uredo culmorum, Schum. 
Erysihe longissima, Wallr. 
On leaves of Glyceria aquatica, G. fluitans and Phalaris 
arundinacea. 
. Forming thin, brown, parallel streaks on leaves, often 
several inches in length. The mycelium is perennial in 
the rhizome, hence when a plant is once infected, it produces 
the disease ever afterwards. 
Europe generally, N. and S. America. 
Ustilago salveii, Berk, and Broome. 
Sori forming long streaks on the leaves, at first covered 
by the epidermis, then powdery and brown ; spores globose. 
