Lyman. — Studies of Hymenornycetes 
EXPLANATION OF PLATES. 
The figures of plate 18 to 22 were drawn at the level of the stage with the 
aid of a camera lucida, using various combinations of Zeiss lenses giving the 
approximate magnifications mentioned. These plates were reduced in 
photographing to about § their original size, and the magnification given 
with each figure is the original magnification of the drawing before reduction. 
Plates 23 and 26 are photographs of living material or of herbarium speci¬ 
mens. Plates 24 and 25 are photomicrographs of sections stained in Heiden- 
hain’s haematoxylin. 
PLATE 18. 
Polyporus fumosus Fr. 
Fig. 1. Hypha forming chains of oidia. X 550. 
Corticium subgiganteum. 
Fig. 2. Section of hymenium. X 220. 
Fig. 3. Mature basidiospore. X 390. 
Fig. 4-5. Germinating basidiospores. X 390. 
Fig. 6. Diagrammatic section through the cup-shaped fructification of 
Michenera artocreas, showing the hymenium and the brownish 
bands formed by the successive periods of growth X 20. 
Fig. 7. Portion of hymenium and subhymenium of Michenera showing 
spores and paraphyses. X 220. 
Fig. 8-9. Groups of sporophores of Michenera showing basipetal branching 
and spores of various ages. X 550. 
Fig. 10-13. Stages in the development of a Michenera spore. X 1000. 
Fig. 13. Mature Michenera spore. X 1000. 
Fig. 14. An immature Michenera spore with vegetative hyphae arising from 
the stipe and appendage. X 390. 
Fig. 15. Germinating Michenera spores. X 390. 
Fig. 16-21. Abnormal Michenera spores. X 550. 
