84 West.— On Stigeosporium Marattiacearum and 
obviously are not homologous with the structures designated vesicles by 
Kusano (1. c., p. 32 et seq.). Gallaud (1. c.) claimed for these structures, 
which are almost universally distributed amongst mycorrhizal fungi, a 
function as temporary reserve organs, and, in the opinion of the present 
writer, this interpretation is the most satisfactory which has yet been 
given. 1 2 
Text- fig. 6. Vesicles of Stigeosporium Marattiacearum in cortical cells of {a, b) roots of 
Angiopteris eveda , Hoffm., and of (c, d) roots of Archangiopteris Henryi, Chr. et Gies. Con- 
tents of host-cells not shown, x 300. 
iii. Resting spores . 
Special interest attaches to this mycorrhizal fungus, inasmuch as it 
produces under natural conditions distinct reproductive bodies (other than 
‘ vesicles ’) within the tissues of the host-root. 
Distributed among the inner cortical cells of infected roots of every age 
and size, characteristic thick-walled spores were frequently noticed (Text- 
figs. 7 and 8 ; PI. Ill, Figs. 1, 2, 5, and 6). 2 These spores, which are 
usually spherical (32-45 \ a), but occasionally ovoid, pyriform, &c., occur 
1 For a full discussion of this question the reader is referred to the works of Gallaud ( 22 , p. 130 
et seq.) and of Kusano ( 30 , pp. 36, 37). 
2 The isolated spores observed by Kuhn ( 28 , p. 493, Taf. XX, Fig. 39) in Kaulfussia aesculi- 
folia , Bl., were probably identical with these. 
