MTCOLOOICAL NOTES 



311 



MYCOLOGICAL NOTES.— VI. 



By W. B. Gkove, M.A. 

 (Continued from p. 17.) 

 MlLESIXA. MURARI.E COUlb. 110V. 



Uredo murarias P. Magn. in Ber. Deutsch. Bot. Gesell. 1902, xx. 

 611. Fisch. Ured. Schweiz, p. 538. 



Uredo (Milesina?) murariae Klebahn u. Lind. in Flor. Mark 

 Brand. Pilz. v a, p. 851. 



Uredosori hypophyllous, covered by the epidermis, small, incon- 

 spicuous, whitish, bullate, collected on yellowish fading spots of the 

 leaf, often surrounded by a delicate at length wide open peridium, 

 composed of more or less" isodiametric translucent pale-coloured cells, 

 which become elongated round the orifice and paler. Uredospores 

 variable, roundish, ellipsoid, oval, or obovoid, 30-45 x 20-24 p ; 

 membrane colourless, U-2 p thick, at first quite smooth, at length 

 marked with rather few distant, irregular, not prominent warts; 

 contents very granular, colourless ; no germ-pores ; each spore seated 

 at first (when young) by a truncate base on a supporting cell as in 

 Melampsora populina. The sorus is surrounded by 1-3 rows of 

 clavate, hyaline, pedicellate paraphyses. 



Milesina murarw.-A, Paraphyses ; B, Spore. The other figure is that of 

 an intermediate form between a paraphysis and a spore. X 600. 



On living leaves of Asplenium Ruta-muraria, Dundonald, Ayr- 

 shire (Boyd)! Sept.-Oct., 1921. 



This very rare parasite has been found in Scotland before (Crypt. 

 Soc. Report, 1907), but was at that time included under the old 

 Milesia Polypodii B. White. Its uredospores show it to belong to 

 the genus Milesina, but it is different from M. Blechni, and other 

 species of that genus, in having a circle of rows of clavate paraphyses 

 round the sorus and in its irregularly warted (not echinulate) spores. 



The peridium is not always present— at least, I could sometimes 

 see no signs of it. On account of this and the paraphyses, this 

 species resembles Hyalopsora Feurichii Fischer, which grows on 

 Asplenium septentrionale. In fact, this latter is equally a Milesina, 

 and should be called Milesina Feurichii Grove. The paraphyses 

 are modified spores ; the typical clear transparent paraphysis is shown 

 at A, the very granular spore at B, but between these all possible 



