14] 
only 4-6 rows of cells on each side of the costa, and figures b and ¢ 
may be only a rough attempt to show these cells, instead of 
being intended for papillae, which would be much exaggerated in 
size. As no mention is made in the original description of the 
cells being papillose, and as Mitten’s specimens agree in all other 
respects with the description of type specimens collected by 
Leprieur in Guiana, it would be natural to suppose that they are 
typical of this species. Numbers 494-496 of Spruce were also 
distributed as this species. 
Carl Mueller* was responsible for describing this species as 
papillose (‘‘grossiuscule papillose-areolata”); whether he ever 
Saw type specimens does not appear, though he states that it is 
“dioicous.” I have discovered some confusion and mixture in 
Montagne’s herbarium between two other species, F. radicans 
and F. gutanensis, and it is just possible that the specimens sent 
to Mitten may not have been typical, though marked ‘‘ex Hb. 
Montagne,” or Mueller may have had a mixture. 
F. corticola Schimp,; Besch. (not Montagne) from Guadeloupe 
has the same prominent mamillose cells, sharply toothed margins, 
and great inequality of the duplicate blades; but the costa is 
percurrent into an apiculate apex, the duplicate blades of the 
perichaetial leaves are bordered, as in F. diplodus Mitten (1869) 
and F. constrictus C. Muell. (1897), and all of these species are 
larger, with a greater number of leaves than in F. Donnellit. 
F. muriculatus Spruce differs in the smaller (5-8 y) cells of the 
leaves and in the peristome, the teeth of which have 2-3 trans- 
versely elongated, thick, basal segments and are not spiral at 
apex. 
ELIZABETH G. BRITTON. 
DESCRIPTION OF PLATE 233 
I. Sterile plant with 6 pairs of leaves. 
2. Fertile plant with 3 pairs of leaves, the perichaetial much the longest pair. 
Seta and capsule erect, calyptra apical. 
3- One pair of leaves, showing costa ending below the ap q I 
blades 
4. Poaeeea leaves, showing the serrate and unequal duplicate blades 
5. Apex of leaf, showing larger, irregularly serrate, marginal cells and profile of 
dorsal surface with projecting, sharply mamillose cells 
4 14H "w ‘ 
* Synopsis Muscorum 2: 534. 1851. 
