NEW OR NOTEWORTHY FUNGI 17 



smooth; finally opaque brown or black (guttulae invisible), 9-10 

 X 6/i, globose in end view, minutely asperate. 



Berkeley described the hyphae as paler ujnuards instead of 

 doivmvards, probably by a slip of the pen. This species is easily 

 propagated by putting a few spores on damp blotting-paper, and 

 keeping under a bell-glass. Ultimately ChcRtomium chartarum 

 always makes its appearance on the same paper, so that probably 

 the Stachybotrys is a conidial stage of the other, but I have not 

 tried any cultivations with adequate sterilization of the matrix. 

 There is no reason for considering S. asperula Mass. and S. scabra 

 Cooke & Harkn. as species distinct from S. lobulata. 



160. Periconia pycnospora Fres. Sacc. Syll. Fung. iv. ; Trans. 

 Brit. Myc. Sos. i. 71. 



Conidiophores |-1 mm. high, aggregated in a distinct black 

 spot, but not or rarely crowded, rigid, shining, black (dark brown 

 and almost opaque by transmitted light), 12-15 ^ diam., with few 

 (4-7) septa, lobed and slightly inflated and paler at the apex, where 

 they are faintly denticulate. Conidia globose, catenate, basipetal, 

 brown, slightly paler than the hyphge, without any evident api- 

 culus, distinctly and beautifully muriculate, 15-20 /a ; head of 

 conidia globose, 50-70 /x diam. (Tab. 516, fig. 2a.) 



The conidia are plainly concatenate, growing like those of 

 Penicillium with the youngest at the base ; when water is added, 

 they immediately separate. Whether P. byssoides (Mass. Fung. 

 Fl. iii. 369) is the younger state of this is uncertain ; the size of 

 the spores there given, 5-7 /x, seems to render it improbable. 



On dead herbaceous stems, Sutton Coldfield, Studley, Coles- 

 hill, &c. (Wk.), November-May. 



161. Periconia Desmazieri Bon. Sacc. Syll. Fung. iv. 274. 

 Mycelium a few, creeping, colourless hyphas at the base ; 



conidiophores erect, nearly straight, about 100 fx high, 4-5 fi thick, 

 hyaline at base and becoming fuscous upwards, with only one or 

 two septa, bearing at the top a cluster of oblong lobes which are 

 sometimes brown, at others nearly colourless. Conidia collected 

 into a round black head which is 25-30 /jl diam., elliptic-oblong, 

 fuliginous-fuscous, opaque, obtuse at each end, smooth, 11-14 fx 

 X 4-5 II. (Tab. 516, fig. 2b.) 



On stems of Heracleum, Bradnock's Marsh (Wk.), October. A 

 minute species, differing apparently from all others in having the 

 base of the stem paler than the upper part. It approaches Stachy- 

 botrys x>apijrogena Sacc. (Syll. iv. 269), but is plainly different. 

 Other species of Periconia, such as P. digitata (Syll. iv. 274), 

 have lobe-like sporophores at the apex ; the distinction from 

 Stachybotrys appears to lie in the fact that in the latter the sporo- 

 phores are distinct cells, not merely lobes of the hypha. 



162. Zygodesmus fulvus Sacc. Syll. Fung. iv. 286. 

 Golden-ochraceous, variously effused ; hyphae intricately 



branched, 6-10 /x thick, without clamp connections, yellowish ; 



Journal of Botany. — ^Vol. 50. [Jan. 1912.] c 



