Eev. M. J. Berkeley and Mr. C. E. Broome on British Fungi, 361 



divided ; heads small, composed of subdichotomous threads con- 

 sisting of oblong sublinear spores about 0*0002 inch long. 



Graphium tenuissimuniy Corda, and Periconia chlorocephala, 

 Fries, belong evidently to the same genus. It is to be observed 

 that in H. delicatum the flocci, when squeezed, often split longi- 

 tudinally, though they are not in the slightest degree com- 

 pound. 



Plate IX. fig. 4. Plant magnified. 



819. Monotospora sphmrocephalay n, s. Stratum efFusum 

 nigerrimum ; floccis simplicibus, sporis globosis Isevibus. 



On a dead stump. Batheaston, Dec. 1858. 



Forming a dense black stratum; flocci black, moderately 

 thick, with two or three septa; spores globose, terminal, even, 

 •001 inch in diameter, sometimes seated on a swollen base. 



This is very near Monotospora megalospora, B. & B., but the 

 spores are globose, not obovate, and smaller. 



Plate IX. fig. 5. Plant magnified, 



820. Dendryphium comosum, Wallr. Fl. Crypt, vol. ii. p. 300 ; 

 Cord. i. p. 21, fig. 279. 



On dead nettle stems. Batheaston, December 1858, C. E. B. 

 The base of the flocci is sometimes sheathed, as in the genus 

 Sporochisma. 



821. O'idium csquivocum, Berk. & Br. ; Torula (Eqaivoca, Cord, 

 Fasc. 2. tab. 9. f. 37. On Polyporus Schweinitzii, Dorsetshire, 

 Eev. J. H. Austen. 



Our plant seems to be precisely that of Corda, which was 

 developed on the spores of Seknosporium Hippocastanij of which 

 he was observing the germination. 



821*. Psilonia nivea^ Fr. Syst. vol. iii. p. 450. 



On the bark of a beech-tree. Brington, Huntingdonshire, 

 P. Fernie, Esq. 



Remarkable for its curled flocci, which sometimes resemble 

 unrolled spiral vessels. 



822. Arthrohotryum atrum, n. s. Stipite brevi ; sporis magnis 

 apicibus hyalinis ; articulis insequalibus. 



On dead nettle stems. Batheaston, Dec. 1858, C. E. B. 



Minute. Stem short, composed of simple articulated threads, 

 which are swollen above, and terminate in subelliptic, very ob- 

 tuse, unequally-articulated spores, which are dark in the centre 

 and hyaline at the extremities, '001 -•0015 inch long, exclusive 

 of the swollen base. 



This very beautiful plant is evidently congeneric with A. stil- 

 boideum, Cesati, figured, but not described, in ' Hedwigia,^ and is 

 readily distinguished by the much larger spores. 



Plate IX. fig. 6. a. Plant magnified; b. spores and threads more 

 highly magnified. ■ 



