328 Rev. M. J. Berkeley and Mr. C. E. Broome on British Fungi. 



*S. Rusci, Wallr. Comp. Fl. Germ. p. 776. S. atrovirens 8. 

 Rusci, Eng. Fl. vol. v. pt. 2. p. 272; Desm. 1281. 



Common on leaves of Ruscus aculeatus, as at Wareham, from 

 whence it has been sent by the Rev. W. Smith. Asci lineari- 

 clavate; sporidia biseriate, oblong, obtuse, 4-5-septate. 



*$. derasa = S. calva, Johnst. Fl. Berw. Perfect specimens of 

 S. calva, Johnst. t, have lately been received from Mr. Bloxam. 

 The asci are clavate; the sporidia biseriate, fusiformi-filiform, 

 slightly curved, filled with a row of nuclei, at length faintly sep- 

 tate. One of the articulations is sometimes swollen. Specimens 

 exactly agreeing with S. comata, Tode, have been sent from South 

 Carolina by Mr. Ravenel, which have oblong multiseptate spo- 

 ridia, with one or more vertical septa occasionally as in S. her- 

 barum ; we have therefore no hesitation in considering Dr. John- 

 ston's plant as a distinct species. 



Plate XI. fig. 25. a. Sporidia of S. comata from South Carolina; b. 

 sporidia of S- derasa. Both highly magnified. 



*/S. acuminata, Sow.! t. 394. f. 3 = S. Carduorum, Wallr. Comp. 

 Fl. Germ. vol. iv. p. 805 ; Desm. Ann. d. Sc. Nat. 2 ser. vol. xvii. 

 p. 106. Common on dead thistle stems. 



The spores in this species are linear, and contain at first 

 numerous nuclei without articulations; at a later period of growth, 

 however, the articulations are very manifest, aud we doubt not 

 that S. acuminata, Sow. ! is in truth the perfect form of Wall- 

 roth's species. In S. coniformis, the fructification of which is 

 figured by Greville as that of S. herbarum, to which species 

 therefore S. acuminata was referred in the e English Flora' as 

 agreeing to a certain extent in the sporidia, the number of joints 

 is about half as great as in the present species. In S. coniformis 

 there are about eleven joints, in $. acuminata about twenty. The 

 sporidia, whether young or old, have a swelling near the apex, 

 which is at the second articulation in the perfect sporidium. 

 Plate XI. fig. 26. a. Sporophores ; b. spores in situ. Both magnified. 



*S. Arundinis, Fr. Syst. Myc. p. 510, var. Tritici. On wheat- 

 straw, King's Cliffe, May 1, 1843. 



Differing in no respect from the typical form, except in size. 



t Dr. Johnston found also at Berwick, on Senecio Jacobcea, a fine species 

 of Phlyctcena, which, as the genus is new to this country, we take this 

 opportunity of characterizing : — 



Phlyctcena Johnstoni, n. s. Maculis latioribus ; jiseudo-peritheciis brun- 

 neis ; sporophoris flexuosis amplis, sporis elongatis curvis, medio nodulosis. 



The spores are several times longer than in the original species, the spo- 

 rophores highly developed, and towards the centre of the spores there is 

 generally a distinct knot, and frequently the outline is more or less irre- 

 gular. 



