of Poronia punctata (A.). 
261 
EXPLANATION OF FIGURES IN PLATES 
XIV AND XV. 
Illustrating Miss Dawson’s paper on Poronia punctata . 
PLATE XIV. 
Fig. 1. Stromata of Poronia punctata from nature, a , stromata-stalks embedded 
in the substratum; b, stromata raised above the substratum. 
Fig. 2. Group of individual stromata of different types, drawn from nature. 
Fig. 3. Series of stages of growth of a group of stromata, cultivated in a pure 
state from an ascospore, on horse-dung extract in gelatine and agar. Ascospore 
sown on Nov. 4. a = Nov. 23; £ = Nov. 27; ^=Nov. 29; d— Dec. 1; <? = Dec5; 
/=Dec. 8. T. = 15° C. (Nat. size.) 
Fig. 4. Stages in growth of stromata with disk-shaped, heads, from germinating 
ascospore, sown Nov. 18. a = Nov. 28; £ = Dec. 3; c andaT=Dec. 11, showing 
two portions of culture, drawn separately; e = Jan. 17. This culture transferred 
from gelatine medium to cotton-wool on Nov. 28. (Nat. size.) 
Fig. 5. Branched stroma, grown in pure culture, on cotton-wool medium, from 
conidium germinated in gelatine medium. This stroma formed in eight days, 
after the culture was aerated and kept in the light. T. =17°. (Nat. size.) 
Fig. 6. Proliferation of head of stroma, after apex has been cut off. a = Feb. 23 ; 
£ = Feb. 26; c = Mar. 1; d— Mar. 5. T. = io°-I5°C. (This represents later 
stages in the development of the stroma to the extreme left of Fig. 4 0.) (Nat. size.) 
Fig. 7. Two unusually large stromata grown up on culture drawn in Fig. 4 e, 
after increased aeration and lower temperature. Age, Jan. 17-Feb. 26. T. = 
io°—12° C. (Nat. size.) 
Fig. 8. Low power drawing of individual young stroma, as shown in Fig. 3 a , 
nineteen days after sowing of ascospore. Horizontal mycelium flattened parallel 
to erect stroma, crystals of calcium oxalate in substratum. ( x 12.) 
Fig. 9. Crystals (Fig. 8) under obj. |. 
Fig. 10. Portion of mycelium grown from conidium in hanging drop culture. 
Separation of crystals from substratum. Eleven days old. (x 180.) 
Fig. 11. Different methods of germination of conidiain gelatine, with horse-dung 
extract. ( x 350.) 
Fig. 12. Consecutive stages in germination of conidium in hanging drop, a , 
Nov. 7, 1 p.m.; b, Nov. 8, 10.30 a.m.; c, Nov. 9, 10 a.m ; d , Nov. 10, 10 a.m.; e , 
Nov. 10, 3 p.m.; /, Nov. 11, 10 a.m.; g , Nov. 12, 8.45 a.m. 
Fig. 13. Consecutive stages in germination of ascospore in hanging drop. 
Medium = gelatine with horse-dung extract. <z = Nov. 10-12; £ = Nov. 13, 
11 a.m., t. =17°; c, 2.30 p.m., t = i8°; d, 5.15 p.m., t. = 17°; e, 7.10 p.m., t.= 
I 7°,5 ;/> IO - I 5 p.m.,t. = i8°, 5; g, 11.30 p.m., t. = i8°, 5; h, Nov. 14, 12.30 a.m., 
t. = 18°, 5. (x 350.) 
Fig. 14. Mycelium from spore, shown in Fig. 13 ; Nov. 14, 10.30 a.m., t.= 17 0 . 
(x 100.) 
