SUPPLEMENT TO WELWITSCIl's AFEICAN FUNGI. 179 



one may judge in the absence of type specimens, includes P. Flcuum 

 Niessl. The specimens of this in Herb. Brit. Mus. are undoubtedly 

 identical with P. repens ; the spore -measurements given by Niessl 

 are somewhat smaller, but the habit and appearance of the plants 

 are the same, and the tendency of the stroma to follow the veins 

 of the leaf is characteristic throughout. 



P. iRREGULAKis. Isotkea irregularis Welw. & Curr. /. c. p. 285. 

 The stromata of this species are thickly scattered over large 

 portions of the leaf ; they are minute, black, shining, and seldom 

 confluent ; as a rule, there is but one perithecium in each stroma. 

 The spores are continuous, oblong-obtuse, 12-7/^, and are irregu- 

 larly grouped in two rows in the ascus. 



On the leaves of a species of Ficits (cf. Herb. AVelw. No. 6335), 

 Goluugo Alto; March, 1850. No. 2. 



P. MiNUTissiMA. Isothea minutisslma Welw. & Curr. /. c. The 

 specimen in the Herb. Brit. Mas. is barren, but the description of 

 the spores, 15 /x in length, and the habit, are those of Phyllachora. 

 The stromata are smaller than those of P. graminis, its nearest ally. 



On the leaves of a species of Pennisetuvi (Marianga), Golungo 

 Alto; Sept., 1855. No. 31. 



Dothidella Welwitschii, n. sp. Stroma broadly effused, 

 black, covered by the withered and whitened epidermis ; perithecia 

 small, crowded, irregularly oval; spores oblong-elliptical, 15 x 3/x, 

 hyaline, with a slight yellow tinge. 



On the leaves of Tumhoa Bainesii Hook. f. near Cabo Negro, 

 Mossamedes ; Sept., 1859. No. 206. 



D. Graphis, n. sp. Stromata gregarious, forming small, black, 

 irregular, elongate spots, rather flat and punctuated by the peri- 

 thecia ; perithecia scattered, small, hemispherical or lentiform ; 

 asci ovate-oblong, 33-35 x 10-15 /x; spores colourless, fusiform, 

 1-septate, 15 x 2 /x. 



On the branches of a shrub without flowers or leaves, near 

 Maianga do Povo, Loanda. March, 1854 ; No. 507. 



Microthyrium Millettise, n. sp. Perithecia scattered, about 

 I mm. in diameter. Asci somewhat ovate, 55 x 35 //,, spores 

 colourless, 2-celled, very large, 35-40 x 10-12 /x. 



Golungo Alto. On both surfaces of the leaves of Millettia 

 Grifoniana Baill. On the Serra do Alto Queta, towards the river 

 Luinha ; July, 1856. No. 223. 



Stilbum sericeum and c^spitosum (Welw. & Curr. I. c. p. 291) 

 have been transferred by Saccardo to the genus Cilicipodium ; but 

 on examining the specimens I find that they correspond more nearly 

 with Stilbum. 



ExospoRiUM CELATUM. Sporiclesmium celatum Welw. & Curr. I. c. 

 p. 292, tab. 17, fig. 15. The fungus forms small pustules on the 

 under side of the leaf, which are covered over by the large stellate 

 hairs ; it also causes black barren swellings on the corresponding 

 parts of the upper surface. The spores are oblong, slightly tapering 

 towards the obtuse extremities as figured by Currey ; they are brown, 



o 2 



