The Scottish Naturalist. 273. 



1618. Vibrissca microscopica, B. & Br. Minutissima ; stipite brevi nigro ; 

 capitulo griseo. On damp fir wood. Rannoch, Dr. Buchanan White. 

 Scarcely visible without a lens. Stem very short, black ; head grey, 

 leaving a cup-shaped depression when completely washed off. Sporidia 

 ejected, filiform. [In the Black Wood, near Camachgouran ; very 

 rare.] 



16 1 9. Peziza (Geopyxis) arcnaria, Osb. ; Fr. Syst. ii. p. 65. On sands 

 near St. Andrews, Rev. M. Anderson. This very curious species, which 

 is so brittle that it is difficult to preserve good specimens, forms a cylindri- 

 cal or forked process penetrating the sand and collecting its particles. The 

 roots of the Psamma are often attached, and perhaps in some cases have 

 been mistaken for mycelium . 



1624. Hetotium laburni, B. & Br. Breviter stipitatum, cupulis extus 

 villosis furfuraceis pallidis, margine inflexo ; disco ochraceo lceticolori ; 

 sporidiis fusiformibus quadrinucleatis. On decorticated branches of Cyiisus 

 laburnum, or beneath the cuticle, which it seems to throw off. Menmuir, 

 Rev. M. Anderson. Sporidia "0009 inch long. Mr. Philips, who has 

 paid great attention to the genus, writes that the only species approaching 

 it in the fruit is Helotium salicellum, Fr. Karsten has a species, Pezicula 

 subliciformis, which has sporidia nearly the same size and shape, with 

 two nuclei, but is otherwise different. 



1625. Nectria Keithii, B. & Br. Peritheciis minutis, pallidis, congestis, 

 furfuraceis, ostiolo distincto ; sporidiis fusiformibus inarticulatis ; conidio- 

 phoris punctiformibus confluentibus cameo-griseis. On cabbage stalks. 

 Forres, Rev. J. Keith. Sporidia '0002- '00025 inch long, conidia "0002. 



1627. Sphcetia empetrt, Fr. Syst. ii. p. 522. On leaves of Empetrum 

 nigrum. Sow of Athol, May 1874, Dr. Buchanan White. Asci '002 inch 

 long ; sporidia pale brown, linear, uniseptate, '0007 inch long. 



* Labrella ptarmicce, Desm. ; Fr. El. ii. p. 149. On leaves of Achillea 

 ptarmiccE. Rannoch, Dr. Buchanan White. These are the first truly 

 British specimens we have seen. 



1630. Rhytisma empetri, B. White. Ambiens, atrum, Iucidum, secundum 

 longitudinem rugosum. On Empetrum nigrum. Rannoch, [Perthshire, 

 Inverness-shire, Aberdeenshire, &c] Dr. Buchanan White. Completely 

 surrounding the stem, shining jet-black, wrinkled longitudinally. The asci 

 are straight and immature. [In examining specimens which had been kept 

 in the open air all winter, I find no trace of asci, but abundance of 

 Sphseropsis-like fruit. This consists of spores, in various stages of develop- 

 ment, borne upon comparatively stout pedicels. The pedicels are somewhat 

 unsymmetrical in outline, closely crowded together, and more or less filled 

 with a granular yellowish endochrome, but otherwise transparent. The 

 base is yellowish brown. Length of pedicel about 'OOi5-'ooi inch. The 

 spores are in various stages of development. At first spherical and less in 

 diameter than the diameter of the pedicel ; then larger, and finally ovate 

 oblong. They are filled with granular yellowish endochrome in which, 

 when the spore is nearly mature, may sometimes be seen a clear yellow nucleus. 

 After the spore has fallen off the endochrome divides, leaving a somewhat 

 irregular transparent band across the middle of the spore. Length of mature 

 spore about '00075 inch. This structure of Rhytisma empetrimny be com- 

 pared with that of R. maximum Fr. , as described by Mr. C. B. Plowright, 

 in " Grevillea" iv. 28. PI. 53. Compare also Tulasne t. xvi., fig. 4.] 



