( 269 ) 
this form is characteristical of most of the American specimens. More 
distinguishable is the rimose-areolate crust of Verr. JSuscella, Koerb. 
(Sagedia fuscella, Fr.) represented, if I mistake not, by a lichen from 
lime- and flint-rocks, Alabama (Mr. Peters) and possibly by others from 
Vermont (Messrs. Russell and Frost) but reduced also by Nylander to a 
variety of V. nigrescens. From this however the writer just cited still 
keeps apart his V. virens (Pyrenoc. p. 24. Sagedia Nove Anglia, Tuck- 
erm. tm litt.) occurring on schist in Vermont (Mr. Frost) as on other rocks, 
also not without trace of lime, in Massachusetts. —— V. rupestris, Schrad. 
Lime-rocks. Canada (Mr. Drummond). Maryland. Virginia (Rev. Dr. 
Curtis). Texas (Mr. Wright). Var. purpurascens, Scher. Alabama (Mr. 
Peters). ——V. muralis, Ach. Old mortar in the old Watertown burying- 
ground. On mortar, and dead sea-shells, New Bedford (Mr. Willey). A 
not dissimilar lichen from lime-rocks in New York, and Vermont (Mr. 
Russell) and Canada West (Mr. Drummond@) is perhaps also to be referred 
here. The species is reduced to a variety of the last (but ill-represented 
in my American specimens) by Nylander, and Th. Fries. 
Sect. 2.—SPORES BI-QUADRI-PLURILOCULAR. 
V. Nylanderi, Hepp (Flecht. Eur. n. 440; Koerb. Parerg. p. 350) 
v. Hudsonana, Hepp l. c.n. 945. On serpentine, near Hoboken, New 
York (Hepp, J. c.). The lichen is unknown to me. In the European one 
(Rabenh. Lich. Hur, n. 594) I find the paraphyses, however more distinct 
than in most other Verrucaria, still imperfect. And in this respect an 
externally similar plant found here on granitic rocks (New Bedford, Mr. 
Willey) with capillary paraphyses, and smaller, narrower, 2-3-locular 
spores (0,014-21™™. long, and 0,005-7™™- wide) must be pronounced differ- 
ent. Canadian specimens on limestone (Mr. Drummond) agreeing pretty 
well with the others named, in general aspect and in the small fruit, offer 
ovoid, bilocular spores (0,011-23"™™. long, and 0,007-9"™"- wide) and the 
paraphyses are undistinguishable. It must be left to further enquiry to 
determine the rank of these lichens. Nylander (Pyrenoc. p. 54) regards 
Hepp’s plantas only asmall-fruited form of V. conoidea, Fr.—— V. pyren- 
ophora, Ach., Nyl. Lime-rocks. Trenton Falls, New York. Also at 
Chittenango, N. Y. (Mr. Willey) and Missouri (Mr. Hall). Thallus tar- 
tareous, continuous and at length rugulose, or now chinky, ash-coloured, 
variegated more or less with black lines. Spores 4-locular, 0,032-46™™- 
long, and 0,011-18™™- wide. — From this I cannot but separate a Verrucaria 
of the present section, from lime-rocks in-Canada (Mr. Drummond) which 
presents a thallus of minute, rounded, olivaceous becoming grayish, 
commonly discrete granules; apothecia scarcely exceeding 0™™ 2, to 
om. 3, in diameter, or less than half the sizeof those of V. pyrenophora ; 
and ovoid, 4-locular spores, 0,023-30"™ long, and 0,009-11™™ wide. It 
has unfortunately been collected only once, but may conveniently be 
distinguished as V. microbola. 
