126 
BRITISH SPHiEROPSIDEiE . 
Gen. 7. LIBERTELLA, Desm. Sacc Syll. ill., 744. 
Pustules or nuclei of variable form, long, covered by tbe 
epidermis, often at length erumpent in bright-coloured tendrils. 
Conidia filiform, bent, long, continuous, hyaline. 
640. Iiibertella faginea, Desm. Sacc. Syll. 3892. 
On Fagus sylvatica. Abinger. 
641. Iiibertella rosae, Desm. Sacc. Syll. 3894. 
On rose twigs. King’s Cliffe ; Berwick ; Kew. 
642. Libertella betulina, Desm. Sacc. Syll. 3897. 
On birch bark. Glamis. 
Gen. 8. N.EMASPORA, Pers. Sacc. Syll. ill., 746. 
Pustules or nuclei variable in form, long time covered by the 
epidermis, bright coloured, rather gelatinous. Conidia sausage- 
shaped, rather short, continuous, hyaline, often expelled in 
tendrils. 
643. Naemaspora micros pora, Desm. Sacc. Syll. 3910. 
On branches. Highgate ; Mickleham. 
Gen. 9. MARSONIA, Fisch. Sacc. Syll. III., 767. 
Pustules always or for a long time covered by the cuticle, 
globose- discoid, pallid. Conidia ovoid or oblong, uniseptate, 
hyaline. 
644. Marsonia populi ( Lib .), Sacc. Syll. 4024. 
On poplar leaves. Rushton. 
645. Marsonia juglandis (Lib.), Sacc. Syll. 4028. 
On walnut leaves. Heatishead; Fern. 
646. Marsonia potentillae (Desm), Sacc. Syll. 4037. 
On Potentilla leaves. 
B. Ph^ospor^:. Sporules coloured. 
Gen. 10. MELANCONIUM, Link. Sacc. Syll. III., 749. 
Pustules or nuclei subcutaneous, conical or disciform, black. 
Conidia acrogenous, globose then oblong, continuous, sooty 
brown, at length erumpent in black masses or tendrils, staining 
the matrix. 
647. Melanconium magnum (Grev), Sacc. Syll., 3946. 
On walnut branches. Gopsall. 
648. Melanconium elevatum, Corda. Sacc. Syll. 3950. 
On oak branches. Langridge. 
649. Melanconium sphaeroideum, Link. Sacc. Syll. 3959. 
On alder. Kew ; Forden. 
650. Melanconium bicolor, Nees. Sacc. Syll. 3963. 
On bark of Betula , Carpinus , Quercus. Hermitage ; Kew ; 
Thomey; Hampstead. 
651. Melanconium betulinum, Sch. Sf X. Sacc. Syll. 3955. 
On bark of Betula alba. Twy cross. 
652. Melanconium sphaerospermum (Pers), Sacc. Syll. 3989. 
On reeds. Tansor. 
