Howard.—On a Disease of Tradescantia. 37 
EXPLANATION OF FIGURES IN PLATES 
IV AND V. 
Illustrating Mr. Howard’s paper on a Disease of Tradescantia . 
Fig. 1. Three spores of Botryosporium germinating in a hanging-drop of 
nutrient gelatine. The sowing was made July 29 at 1 p.m., temp. = 21 — 22 0 C. 
throughout. a = at 12.15 a.m. July 30; £ = 12.35 p.m. July 30; £=12.25 p.m. 
July 30. 
Fig. 2. The same a few hours later, af = 2.30 p.m.; £' = 3.15 p.m.; c' = 3.25 p.m. 
July 30. 
Fig. 3. The same later still. a!' = 6.40 p.m.; £"=7.45 p.m.; c' r — 7 p.m. 
July 30. 
Fig. 4. Three stages in the development of the conidiophore and conidia from 
a mycelium six days old. 0 —Aug. 4, 10 a.m.; £= 11.45 a.m.; £=2.30 p.m.same 
day. The x is in a gas bubble which remained throughout. / = 22 0 C. Zeiss BB. 
Fig. 5. Similar stages of an older conidiophore under i-, showing the develop¬ 
ment of the conidia. a —11 a.m. ; £ = 12.40 p.m.; c = 6.20 p.m. 
Fig. 6. Two heads of the conidiophore, showing the abjunction of the spores, 
each of which has a minute drop-like body at its proximal end—the ‘ disjunctor ’ ? 
Fig. 7. Stages in the formation of chlamydospore-like segments, a, A piece of 
the mycelium of a hanging-drop culture several days old, on Aug. 10 at 10.15 
a.m., showing the accumulation of the protoplasm in certain segments, leaving 
others empty. The segments marked x are the same throughout the series. 
£, The same on Aug. n at 10.45 a.m.; c, at 10.40 a.m. next day ; d, at 11.15 a.m. 
Aug. 13; e, at 8.50 p.m. same day; /, at 11.30 a.m. Aug. 14. The parts with 
firmer walls and filled with protoplasm now pass over to a resting condition, the 
intermediate empty portions shrivelling up. 
Fig. 8. Chlamydospore formation in a coiled piece of mycelium several days 
old. a, on Aug. 10 at 10 a.m.; £, twenty-four hours later; c , forty-eight hours 
later still. The lower part of the coil (at x ) is drawn separately, d, twenty-four 
hours later than c. In addition to forming the chlamydospore-like gemmae, some 
of the segments in c and d are putting forth bud-like processes. 
Fig. 9. Gemmation or budding of old mycelium, a, A piece drawn at 10 a.m. 
Aug. 21; £, the part marked x a week later; £, the same Aug. 31, showing slow 
budding. 
Fig. 10. Piece of the Fungus ( Botryosporium ) under low power to show habit. 
Fig. 11. Portion of a conidiophore, showing septa, spicules, &c., under 
Fig. 12. Terminal portion of spicules and spores under higher power. 
Fig. 13. Portion of conidiophore under still higher power, showing septum 
with pit. 
Fig. 14. Portion of mycelium, showing crystalline accretions, or possibly excretions 
of apparently proteid nature. £. 
