176 THE JOUllXAL OF BOTAXT 



390. Hadrotrichum yirescens Sacc. & Rouin. Syll. iv. 301. 

 Trans. Brit. Mye. Soc. v. 243. 



Conidiophores forming little black linear pustules, about 1 mm. 

 long, which are arranged in groups lying in the grooves of the leaves, 

 and are visible on both sides, bursting through the epidermis, erect, 

 densely crowded, straight, linear, rounded at apex, 1-2-septate, quite 

 simple, brownish, up to 35 x 6 />t. Spores arising by a bud at the 

 apex, at length broadly ovoid, smooth, pale, then brownish, 11-13 X 

 7-S/.1. (Fig. 18.) 



On leaves of A<jrostis vulgaris. Aber3^stwyth. April. 



A variety of this species (var. Pow) has also been found by 

 Dr. J. vS. Bayliss Elliott and Miss Stansfield on Poa at Wood End, 

 Tanworth-in-Arden. There can be no doubt tliat this species is the 

 conidial stage of Dotliidella Agrostidls Sacc. (Miss StansHeld found 

 the two stages on Poa in intimate association), and also that a form 

 of Placospliceria cjramims Sacc. & Ivoum. is the spermogonial stage 

 of the same ascom3^cete. 



391. Sporodesmium myrianum Desm. Exs. ser. 2, fasc. 1, no. 2. 

 Sacc. Syll. iv. 506. 



Tufts hypophyllous, punctiforin, very minute (60-80 />t diani.), 

 each rising from a small soft ])lackish stroma, very numerous, rather 

 densely scattered, a])pressed, black, forming greyish blotches on the 

 leaf. Conidia p3a-iform, obovate, or ellipsoid, 20-30 x 10-15 /a (or 

 even 20 ^ wide), olivaceous, sessile or nearly so, transversely 3-1- 

 septate, not constricted, the loculi at length more or less obli(|uely or 

 longitudinally subdivided. (Fig. 15.) 



On leaves of Psanima arenaria. Borth ; Sandwich, Kent. July. 



By its large numbers it produces a greyish cloud-effect on the 

 outside of the rolled-in leaves. In both cases it was accompanied, on 

 the same leaves, l)y Camarosporium mefahletlcum Trail. (Fig. 9.) 

 The little mucid stroma from which the spores arise is formed in the 

 leaf, and imparts a peculiar aspect to this species of Sporodesmium. 



ExPLAXATiox OF Plate 563. 

 (All figures x600.) 



1. Ampliorula saclialinensis, spores. 



2. Ascochyta Stellarice, spores. 



3. Phyllosticta Ojcalidis, spores. 



4. Fusicoccum cindum, spores. 



5. Cryptosporium Tami, spores. 



6. Ascocliyta Pferidis, spores. 



7. Sepforia polaris var. scotica, spores. 



8. Septoria Jasiones, spores. 



9. Camarosporium metahleticum., spores. 



10. a, Leptostromella pteridiiuiy spores; h, Didymella Hyphwnis, 



ascus and spores. 



11. Placosplueria Ulmi, sjjores. 



12. Ascochyta carpatliica, spores. 



13. Trullula Si1p)hii, conidiophores and spores. 



