Royal Microscopical Society. 221 



than last year. Some protospores had four tubular projections, two 

 from each side, each one springing from its own side of a cell division, 

 and not always from exactly the same part. Some had only put 

 forth little roundish vesicles, and many only developed tubes on one 

 side, some only a single tube, the rest being abortive. 



At this date (April 1) the Irish junipers show their fungi in a 

 much less developed stage. 



Mr. Keeves mentioned to me a case of P. juni]peri that had 

 formed large warty excrescences on a tree belonging to Mr. Wol- 

 laston, of Chiselhurst, and that gentleman has kindly forwarded me 

 a sketch. It appears that the juniper on which this fungus grows 

 had two leaders, and Mr. Wollaston cut one close off, leaving the 

 usual cicatrix. On each side of this cicatrix the fungus grows, 

 the gelatinous tufts springing annually from two bumps which 

 the fungus has formed. Can this be regarded as an approximation 

 to the habit of the American P. macropus, which makes peculiar 

 galls, that surround the stems it affects, and which have pitted 

 jfacets from which the spore masses spring ? The occurrence of 

 P. fuscum and P. juniperi communis in a non-gelatinous stage 

 assimilates them to Puccinia gymnosporangium, which Mr. 

 Berkeley informs me is separated from Podisoma by the gelatinous 

 element of the latter. 



EXPLANATION OF PLATE XVIII. 



Fig. 1. — Juniperus communis ; the swellings on each side towards the base pro- 

 duced by Podisoma junijjeri communis. (Mr. Wollaston.) 



„ 2. — Podisoma juniperi communis growing out of the swellings in Fig. 1. 



,, 3. — Kind of gall produced by the American Podisoma macropm. The fungus 

 grows out of the facets, as in Fig. 3 — n. s. 



„ 4. — Group of protospores of Podisoma juniperi communis bursting through 

 cuticle, before formation of gelatinous mutter X 135. 



„ 5. — Protospores of ditto x 240, with mycelium stalks. 



J, 6. — Group of protospores of Podisomi fmcum bursting through cuticle, before 

 formation of gelatinous matter x 135. 



,, 7. — Protospores, ditto X 240, with mycelium stalks. 



„ 8. — /-". fuscum — n. s. 



„ 9. — Portion of very young Coleus leaf, with hairs and glands (yellow) having 

 a cross mark upon them x 135. 



,, 10. — Lobe of larger leaf, showing the arrangement of the yellow bodies x 60. 



