The Scottish Naturalist. 163 



mersed in the substance of the matrix, into which the base sends 

 root-like fibres. Spores distinctly spiny, ejected copiously from a 

 minute ostiolum at the summit of the peridium. 



It is with very great pleasure that I dedicate this genus to the 

 Rev. Miles Joseph Berkeley, M.A., F.L.S., to whose researches our 

 knowledge of the mycology, not only of Britain, but of every part 

 of the world, is so deeply indebted, and whose kindness to all 

 students of the same branch of botany is as well known as it is un- 

 failing-. 



'&• 



Milesia polypodii B. White, sp. n. 



M. hypogeneum ; peridiis sph^ricis minutis, pallidis, dispersis ; 

 sporis albidis obovatis echinulatis. 



On the underside of living but fading leaves of Polypodttwi 

 vidgare in June and July. First found in the Den of Reichip ] then 

 in other parts of Perthshire. 



Spores .0012 — .0017 inch long. (Plate II. fig. 5.) The peridia are 

 scattered in an irregular manner on the underside of the frond of 

 the fern, and looks under a lens like little pallid mammiform pro- 

 jections very slightly elevated. The spores are ejected copiously 

 from the ostiolum, and from their whitish colour and abundance 

 are very perceptible. The spores themselves appear under the 

 microscope to be filled with a granular matter. 



I take this opportunity of figuring the uredo spores of Uredo 

 (FucciJiia) pteridt(?n, B. White, described at page 26 of this volume. 

 For the sake of comparison the spores of U. Jiiliacni Desm. are 

 also figured on the same scale. 



EXPLANATION OF PLATE II. 



Fig. I. OHhezia Signoreti B.W. a. antenna of embryonic larva. /3. 



antenna of ^ larva, y. antenna of adult ^ . S tibia and tarsus 



of adult ^ . 

 Fig. 2. Dactyliiim modestum B. and B. W. a. flocci. b. spores. 

 Fig. 3. ,, spxrale B. and B. W. a. flocci. b. spores (side view). 



c. spores (end view). 

 Fig. 4. Bactndium acutum B, and B. W. 

 Fig. 5. Milesia polypodii B. W. a. peridium. b. peridium burst. 



c. spore. — -"^^ 



Fig. 6. Puccinia pfiridujn B. V^ . uredo spores. . -,v-'j£^j^ X 



Fig. 7. Uredo fillictim Desm. spores. /r^^^o^^ ''jw-^'TS 



For figures 2, 3 and 5, I am much indebted to Mr C. E. BroQ^^'j^ ^^.#•^1^ ^^\ O^N 



?Vr#^ 



