Betts. — A Bee-hive Fungus, Pericystis alvei, Gen. et Sp. Nov. 799 
EXPLANATION OF PLATES LXXV AND LXXVI. 
Illustrating Miss Betts’s paper on Pericystis alvei. 
The magnification is uniform for Plate LXXV, and is approximately x 700. The figures were 
drawn with the aid of a camera lucida from unstained material. All the specimens (with the ex- 
ception of those figured in Plate LXXV, Fig. 2 ,a, and Plate LXXVI, Figs. 11 and 12) were taken 
from cultures on honey-gelatine. 
PLATE LXXV, 
Fig. 1. Plyphae and chlamydospores from a young culture, a, hypha with few spores ; b, spores 
on lateral processes. 
Fig. 2. Hyphae and chlamydospores from an older culture, a, an old hypha, cells between 
spores have lost their contents ; b, an oidium-hypha (from comb). 
Fig. 3. Chlamydospores. a. spore germinating, and a chlamydospore forming in the resulting 
hypha. 
Fig. 4. Young cyst ; early stage, before fusion. 
Fig. 5. Two young cysts on one hypha, after fusion. 
Fig. 6. Young cyst ; shortly before wall changes colour. 
Fig. 7. Cyst ; wall has turned green, but spores not yet visible. 
Fig. 8. Mature cyst. 
Fig. 9. Cyst-spores. 
PLATE LXXVI. 
Fig. 10. Mycelium and cysts, x 50. 
Fig. 11. P. alvei growing on pollen in comb. 
Fig. 1 2. Pollen from cells, attacked by P. alvei , and converted into hard plugs 
(Figs. 11 and 12 are slightly more than twice natural size.) 
