Rev, M. J. Berkeley and Mr. C. E. JBroome on British Fungi. 183 



573*. P. salicella, Fr. Syst. Myc. vol. ii. p. 133. On willow 

 twigs, King's Cliffe, 1840. 



574. P. rudis, Berk, in Proc. Nat. Hist. Soc. Berwick, p. 190. 

 Fasciculata turbinato-stipitata hymenio piano hie illic depresso 

 rugoso flavo-fusco subvinoso ; externe subtiliter fibrilloso-striata ; 

 stipite elongate lacunoso vel striato. On shallow gravel and peat. 

 Pease Bridge Dean, with Polytrichum abides, Dr. Johnston, June 

 1846. A full description will be found in the place quoted 

 above. 



Plate VI. fig. 13. a. Plants of the nat. size; b. asci and sporidia mag- 

 nified. 



575. P. Clavus, A. & S. p. 306. Apethorpe, April 1841 ; 

 Hartham, March 1843. 



Sporidia regularly oblong, elliptic, with a sporidiolum at either 

 extremity. 



576. P. testacea, Moug. Fr. El. 2. p. 11. On an old nail-bag, 

 King's Cliffe. Twycross, Rev. A. Bloxam. 



577. P. &pJmrioides, Pers. Myc. Eur. \ Desm. Exs. no. 174. On 

 stems of Lychnis dioica : vei'y common. 



578. P. cornea, n. s. Minima gregaria sessilis primum glo- 

 bosa flavo-cornea demum breviter obconica aurantio-fusca. On 

 dead stalks of Carex paniculata, Spye Park, March 1850. 



Extremely minute, gregarious ; at first globose, yellow horn- 

 coloured, then somewhat obconic or turbinate, becoming of a rich 

 orange-brown, sometimes slightly hollow, but more generally 

 flat and granulated ; margin rather jagged ; sporidia fusiform, 

 slightly curved. 



An extremely pretty though minute species, which is, we be- 

 lieve, undescribed, and quite different from anything pubhshed 

 by Desmazieres. 



579. P. Ugnyota, Fr. Syst. Myc. vol. ii. p. 150. On dead wood, 

 Wraxall, Som., Feb. 1845. 



Sporidia somewhat resembling those of a Diplodia. 



580. Tuber macrosporum,Yiii. Batheaston and Munro'sWood, 

 near Bristol. 



581. T. bituminatum, n. s. Uterus niger, globoso-ovatus, re- 

 gularis, verrucis minoribus polyedi'is muricatus, basi in foveam 

 excavatus. Venae leviter cohserentes plerumque e fovea basilari 

 in carnem immissse. Sporangia ovalia, longe pedicellata. Sporidia 

 fusca, ovata, laxe cellulosa. Odor bituminis et Cochlearice ar- 

 moracice fortissimus. 



Closely allied to Tuber cestivum, Vitt., but easily distinguished 

 by the odour ; it differs also in the general form, being much 

 more regular and the warts smaller, and in the existence of a 

 basal cavity prolonged into the substance of the fungus, which is 



