194 ADDITIONS TO OUR MOSS FLORA. 
spores smooth. Fr. 
H 
AB. Top of the aa of a forcing-pit in the Botanic Gardens, Glas- 
EB 
nevin, Dublin. 
I fear this interesting little moss can hardly be regarded as indigenous, 
for the spores have most probably been mixed with soil attache 
exotic plant, and thus accidentally scattered on the sandstone w 
to some 
all where 
as found. So much do the leaves resemble those of Splachnacee in 
areolation ag at first : was inclined to follow C. Müller and Hampe, 
referring it to that family; but on the other hand, the equally high 
authorities E Glen and Linder place | it in Trichostomace, and after 
careful consideration I am sa sfied that in the structure of the peristome, 
the calyptra like ne Sul Tortula, and the place of growth, it entirely 
accords with that fam 
. Musc. i. p. 118 (18 " Didymodon ? pateret Hook. Mu se. 
Exot. t. 126 (1820). Dissodon E grag Hegesd hi Müll. Syn op. 1. 0 
(1849), from the Antilles, to which th ent species was at first 
e ; 
referred by Sullivant in the * Musci Cubenses Wrighta ' (Proc. Amer. 
Ac. of Arts and Sc. 1861), but it is separated by C. Müller in his paper 
quoted ; and with the Cuba plant the Trish specimens entire 
except that they are much smaller, and though Müller de scribes the leaf as 
* margine integerrimo, " those of the Cuban moss are crenulate, exactly 
like “az one fi uel. 
aoe ay mo of the genus are: 3. S. JallsMágei ©. M., from 
. S. Bernoulli, C. M., from Here à accidum 
Wein eissia "Picos Wow). Hook. Lo Pl. t. 18. f. 3, from i al 6. T 
species from nquebar, growing among pá ‘ichostomum indicum, an 
having papillose te thus affording another character common in Tricho- 
stomaceous mosses. 
GRIMMIACEE. 
The two principal genera of this family, Grimmia and Rhacomitrien 
pass into each other so gradually, that they must be united in any strictly 
natural arrangement, as has been done by C. Müller and Mitten. 
In the 
more typical Rhacomitria we have indeed a distinctive ndi in the 
: Bri 
within the last few years, and we may reasonably expect that G. 
ar enaria, 
* In the lastnumber of ‘Linnea’ (Band iii. Heft 2 p. ils e xd 
two more species of bc. genus, S. Indicum, Ham 
m the cen 
nd 
en, Calcutta, and S. Spruceanum, C. Mil. LS Weisia (§ E Tapeinodon) spia 
Gard 
nifolia, Mitten, hey Aust ust. Amer., from the And 
