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D O T H ID E A R obertiani.
Shining hemispherical Dothidea.
C l a s s a n d O r d e r CRYPTOGAMIA FUNGI, ü t o — N a t . O r d . HYPOXYLA,
De Cand. Grev.
GENERIC CHARACTER.
Cellulæ (plures vel solitarîoe) in siromate immersoe, suhroiundæ, nucleo cereo
farctoe, demum ore simp}lici apertce, absque proprio perithecio.”— F r i e s .
Cellules (several or solitary) immersed in a receptacle, somewhat roundish,
filled with a wax-like nucleus, at length opening by a simple orifice,
without regular perithecia.
SPECIFIC CHARACTER.
Dothidea Robertiani; epiphylla, subgregaria, hemisphaerica, loevis, nitida, ni-
gerrima, intus alha.
D. epiphyllous, subgregarious, hemispherical, smooth, shining, very black;
white within. '
Dothidea Robertiani, Fries, Syst. Mycol, v. 2. p. 564.
Crvptosphæria nitida, Grev. Fl. Edin. p. 363.
H ab. On the leaves (while y e t green) of Geranium Rohertianum. Summer
and autumn. F requent in Dumfriesshire, Sir William Jardine. Common
about Edinburgh, Messrs Wauch and Greville.
Subgregarious, in scattered clusters, never confluent, very m inute, dot-like,
hemispherical, very black, highly polished, smooth, white within, opening
at length at the apex. Sporules oval, very minute, in subpersistent,
erect, clavate, tubular thecae.
A very pretty little parasite, and, as far as I have observed,
entirely confined to the leaves of Geranium Eobertianum.
Though F r i e s has placed it in the genus Dothidea, it seems
equally allied to many of his Sphoeriæ (my Cryptosphoeriæ).
Fig. 1 . a, Dothidea Robertiani, nat. size, b. Plants
one removed, ditto, d, Thee« with sporules, ditto.
VOL. I I I .
c, A sing