[From the BuLLETIN OF THE Torrey Botanica Cus 34: 57-60, AZ. 5-6. 1907] 
Two new sPecies of Aytonia from Jamaica 
CAROLINE COVENTRY HAYNES 
(WITH PLATES 5 AND 6) 
Aytonia Evansii sp. nov. 
Thallus light-green, with a narrow purple margin, plane, ovate 
to linear-oblong, lingylate, 10-14 mm. X 4-7 mm., innovating 
from apex or laterally from costa, or dichotomous ; margins of 
thallus elevated, undulate, crisped ; width of thallus in cross-sec- 
tion eight times that of maximum height; the epidermal cells 
somewhat quadrate with distinct trigones, cuticle finely granulate ; 
the stomata small, not elevated above thallus, 4 or 5 cells around 
the pore in I or 2 concentric series ; ventral scales vinous-purple, 
imbricated, scarcely decurrent, lunate or obliquely ovate, reaching 
beyond thallus and reflexed only at notched apex, well-developed 
and persistent, however, from base of thallus to apex, tapering gradu- 
ally to a long lanceolate occasionally geminate point, margins en- 
tire : oil-bodies completely filling isolated cells occurring generally 
through the thallus excepting in epidermal layer : monoicous : 
receptacles usually several in a series : androecium situated di- 
rectly behind Q receptacle, furcate, surrounded with purple lan- 
ceolate or linear paleae 2-7 cells in maximum width: peduncle 
5 mm. long: carpocephalum 2-3-lobed, generally maturing two 
pposite sporogonia, concave at apex, scales of the carpocephalum 
lanceolate or linear-lanceolate, 5-12 cells in maximum width, 
nearly hyaline : spores averaging 87m, yellow or brownish, en- 
veloped in a very loose reticulate-rugose exospore : elaters 2—4- 
spiral, attenuate at ends 223-306y in length, 13 # in*maximum 
Width. (PLATE 5.). 
The above description has been drawn from material collected 
on banks, near Portland Gap, Blue Mountains, Jamaica, July 21, 
1903, 4. W. Evans 213. 
57 
