190 PODISOMA ON JUNITERUS PHCENICIA. 



Juniperus communis. If the form and constriction of the pseudo- 

 spores can be assumed to have the same specific value as in 

 Puccinia, there may be sufficient grounds for accepting this as 

 distinct, but it must be borne in mind that there is some variability 

 in the amount of rotundity of the upper cell in Podisoma Juniperi- 

 communis, and also in the constriction, although it must be con- 

 fessed that we have never met with such a pronounced constriction 

 as in the form on Juniperus jihcenicia. For the present it may be 

 as well to regard this as a form of P. Juniperi, since we have no 

 authentic specimens of Gasparrini's plant for comparison. In his 

 figures the pseudospores are much broader for their length than in 

 the Marseilles form. If there is any soundness in the view that 

 each species of Podisoma has its corresponding Ecestelia, this form 

 can be verified by sowing the secondary spores on the hawthorn, or 

 those of Ecestelia lacerata on the Juniperus plioenicia, and recording 

 the results. There is sufficient difference in the external habit, as 

 well as the form of the pseudospores, to warrant a suspension of 

 judgment until such an experiment is made ; meanwhile we are not 

 justified in regarding it as the Podisoma fuscum of Gasparrini, but 

 rather as Podisoma Juniperi var. phoenicice . 



Apropos of Podisoma, it may be remarked here that Mr. C. H. 

 Peck has seen the pseudospores of Gymnosporangium Juniperi var. 

 clavipes (" Quekett Journ," vol. ii. p. 258), germinating at the 

 apex and not at the commissure. This would be sufficient to 

 warrant the recognition of this form as a distinct species under the 

 name of Gymnosporangium clavipes, C. & P., which Mr. Peck has 

 assigned to it. 



ON TWO NEW BRITISH SPECIES OF COLLEMACEI. 



By the Rev. J. M. Crombie, F.L.S. 



Since my revision of the British Collemacei, in " Journ. Bot. " 

 for November, lb74, two additional and rather interesting species 

 have been discovered and have been recorded by Nylander in the 

 " Flora," 1875, pp. 102, 103. These are— 



]. Pyrenopsis phylliscella. i\?/7.—Th alius effuse, squamulose, 

 dark-brown, the squamules subverruculoso-unequal, subadnate, 

 aggregated, but not contiguous, rotundato-deformed ; apothecia 

 eudocarpoid, very minute, 5-15 in each thalline squamule ; epithe- 

 cium punctiform, concolorous, with thalline margin ; spores 8-nse, 

 oblongo-ellipsoid, -0,005-7 m.m. long, about -0,003 m.m. thick ; 

 paraphyses few, slender ; hymenial gelatine, bluish, and the thecae 

 dark violet with iodine. 



On quartzose boulders in subalpine streams. Very local, and 

 rare on Ben-y-gloe, Blair Athole (Crombie, 1870). 



