water for some time, and are accordingly nearly unavailable for diagnosis. As the spores in Müller's specimen are almost unique (as regards the genus) in their internal organization, I prefer to describe this lichen apart, more especially as I have already described another (Trans. Roy. Soc. Victoria, 1880) from Queensland, sent by Mr. F. M. Bailey, under the name Parmosticta rubrina. The thallus of Mr. Bailey's lichen has also characters analogous to those of St. rubella, but has spores of quite a different construction from those of Baron Müller's specimen. There are short white hairs on the margin and neighbouring upper surface of the laciniæ, as described by Nylander, l.c., and otherwise the characters are not dissimilar. Parmosticta purpurascens, Strn. Apothecia rufa marginalia, elevata, cupuliformia, magna (latit. 4–8 mm.), receptaculum thallinum extus rubricosum, vix rugulosum, interdum læve, supra, late citrino-sorediosum, inflexum; sporæ 4–8næ, fuscæ vel fusco-rufæ, oblongo-ellipsoideæ vel obtuse fusiformes, 4-loculares (loculis subquadratis et inter se tubulo junctis), interdum etiam 3-septatæ, 0.028–0.03 × 0.01–0.013 mm.; paraphyses distinctæ. Iodo g.h. bene cærulescens. The extremities of the spores are often nearly colourless and almost papilliform. There appear to be two kinds of gonidia; one kind uniformly small, 0.005–0.009mm. diam.; the other large, 0.012–0.028 mm. diam., with yellow granular contents. Sticta lorifera, Strn. Similis St. impressœ, Tayl., et similiter laciniata sed supra cephalodiis numerosis, pallidis, fere globosis adspersa; medulla alba vel pallida, K flavens; subtus nigricans, versus marginem pallidior, dense et breviter nigro-rhizinosa et pseudo-cyphellis parvis pallidis vel interdum albido-flavis; apothecia nigra primum marginata dein immarginata, plana, marginalia, receptaculo extus rugoso vel papilloso-aspero. Gonidia diam., 0.008–0.016 mm. New Zealand, prope Wellington (J. Buchanan). This lichen is included under what Nylander calls “St. physciospora,” but which I hold should be called “St. impressa, Tayl.” The spores are fuscous, shortly polari-bilocular, rarely 4-locular, and 0.022–0.028 × 0.008–0.01 mm. The thallus is divided almost to the base into long, narrow, tapering laciniæ, which are scarcely transversely costate, and only show such ribs near the base. This lichen, so abundant in New Zealand, shows wonderful diversity of aspect, and the present is one of the most characteristic.