=Erysiphe horridula,= Lév. BORAGE BLIGHT; amphigenous; mycelium web-like, sometimes persistent; conceptacles minute, globose, scattered or clustered; sporanges 20-24, oblong-ovate, attenuated downwards, containing 3-4 spores; appendages short, flexuose, and bent upwards.—On leaves of _Lycopsis arvensis_. Shere. October, 1865. (_Dr. Capron._) * * * * * =Chætomium murorum=, Corda. WALL BRISTLE-MOULD; gregarious, glaucous, then blackish; perithecium globose, brown; hairs circinate, erect, septate, pulverulent; spores oblong, yellowish. On plaster. Rare. (_M. J. B._) ------------------------------------------------------------------------ ADDENDA. ------- [The following species have been added to the British Flora since the publication of the Appendix.] =Æcidium Parnassiæ=, Grav. PARNASSIA CLUSTER-CUPS; hypophyllous; spots pallid; peridia in subrotund patches, irregularly disposed, tawny-yellow, between urceolate and concave; the margin thick and nearly entire; spores pallid. _Duby. Bot. Gall._ ii. p. 904.—On leaves of _Parnassia palustris_, near Glasgow. (_Dr. Greville._) The original specimen is in the Edinburgh Herbarium. =Æcidium Statices=, Desm. SEA-LAVENDER CLUSTER-CUPS; hypophyllous; spots subrotund, or confluent and irregular, purple; peridia in subrotund circinating clusters, sometimes irregularly disposed on the nerves and petioles; urceolate; margin lacerated, white; spores orange. _Desm. Exs._ No. 132. _Cooke, Exs._ No. 444.—On leaves and petioles of _Statices_. June, July. Fleetwood, 1859 (_Rev. A. Bloxam_). Walney Island, Lancashire, 1871 (_C. Bailey_). Near Basingstoke, 1871 (_R. S. Hill_). Near Chichester, 1872 (_F. V. Paxton_). =Chætomium funicolum=, Cooke. TWINE BRISTLE-MOULD; perithecia scattered, sub-ovate, black; hairs of the vertex very long, dichotomous or simple, erect, slender, acute, black; sporidia lemon-shaped, dingy brown.—On twine suspended in a vessel containing water at the British Museum. (_W. Carruthers, F.R.S._) March, 1872. This species is most closely allied to _C. elatum_, but much smaller and neater. It is wholly black, and without the fibrous base of _C. elatum_. The hairs are more delicate, not having half the diameter, and the sporidia are scarcely more than half as long or broad. A species of _Polyactis_ afterwards made its appearance on the same mycelium on some portion of the twine left behind with a few immature perithecia. ------------------------------------------------------------------------ EXPLANATION OF PLATES. ------- Plate fig. I. 1. Goatsbeard with its cluster-cups (_Æcidium Tragopogonis_). 〃 2. Fragment of same, slightly magnified. 〃 3. Section of cluster-cup, further magnified.