NEW BRITISH LICHENS. 
99 
Arct.” (1860), p. 57, where it is rightly separated alike from 
P. stygia and P. encausta , to both of which it is closely allied, it is 
named Parmelia alpicola , in which he is now generally followed by 
authors. There is, however, another trivial name older than any 
of the above. In recently looking over a portion of Salwey’s 
Herbarium, now in the possession of the British Museum, I foun l 
a specimen of this plant marked Parmelia encausta; and on still 
more recently referring to “ Schaerer’s Enum.,” p. 42-3, I found 
this same specimen quoted as seen by him, and named Parmelia 
ceratophylla var. atro-fusca , as distinct from var. multipuncta (= 
P. encausta , Sm.). There is, therefore, no doubt that Schaerer’s 
name has priority, and that the plant should be called Parmelia 
atro-fusca (Schaer.). J. M. C. 
TWO SPECIES OF PERONOSPORA. 
By Prof. Passerini. 
1. Pexonospoxa tribulina. 
Hypophylla, caespitibus densis, effusis, candidis ; stipitibus 
erectis, apice parce ramosis, ramis primariis alternis subpaten- 
tibus breviusculis, ultimis subulato-arcuatis. Conidia subglobosa, 
hyalina. 
Ad folia “ Tribuli terrestris ,” L., Parmae in R. Horto Botanico, 
Augusto, 1878. 
2. Pexonospoxa Setaxiae. 
Forma conidiophora. — Hypophylla, late effusa, candida, tandem 
sordidule cinerea ; stipites crassi, primo simplices subclavati, dein 
superne parce ramosi, ramis primariis brevibus suboppositis, 
ascendentibus, apice incrassatis et palmatifido-ramulosis. Conidia 
subglobosa, hyalina. 
In foliis junioribus jam explanatis, pallescentibus, Setarice 
verticillatce , P.B., prope Parmam ( Vigheffio ) aestate, 1878. 
Forma oogoniophora (Protomyces graminicola, Sacc., M. V., n. 
496, Fungi Veneti novi vel critici ser. v., n. 91. Ustilago (?) 
Urbani , Magnus, Sitzungsberichten der Botanischen Vereins der. 
Provinz Brandenburg). Oosporae globoso- angulosae, episporio 
crasso, intense ochraceo-fulvo. 
Ad folia juniora utplurimum convoluta et ferrugin ascentia 
Setarice verticillatce, P.B. Parmae {Vigheffio'), jam ab gestate anni 
1876, reperta absque ullo Peronosporce vestigio; et aestate nuper 
elapsa iterum observata, vel solitaria, vel in formae conidiophorae 
consantio, in eisdem plantis et foliis. 
Hedwigia. — This journal has changed hands, and will have 
for its editor Dr. George Winter. 
