NOTEWORTHY LEJEUNEAE FROM FLORIDA 
149 
line of the free margin and does not form a distinct depression. On the 
underleaves basal auricles are occasionally present, but they are never 
well developed, and are always difficult to demonstrate. 
The South American P. torulosus is still incompletely known and 
it is possible that the species, as at present defined, represents an 
aggregate. The type specimen was collected in "Guiana," and the 
species has since been reported from Dutch Guiana, from Venezuela, 
and from Brazil. In the Hepaticae Spruceanae specimens were 
distributed from Obidos, Brazil, and from the vicinity of Chimborazo, 
Ecuador. These and a portion of the type material in the Mitten 
herbarium have been available for study. 
In the type specimen perianths are present but neither androecia 
nor caducous leaves were detected. The plants are considerably 
larger than those of P. heterophyllus, and the lobes of the leaves are 
relatively broader, measuring 1.1-1.3 mm. in length and 0.95-1.2 mm. 
in width. The ventral margin of the lobe is further distinguished by 
being distinctly revolute. The margin of the lobule is said to be 
entire in the original description, but the marginal teeth were soon 
noted by Lindenberg and Gottsche.^ They usually number four to 
six and are less strongly inflexed than those of the new species but 
resemble them in other respects. The underleaves measure about 
0.5 mm. in length and 0.75 mm. in width; in most cases they show 
small basal auricles, but these are not always distinct and may be 
absent altogether. A leaf, an underleaf, an involucre, and a perianth 
in cross section have been figured by Schiffner,^^ presumably from 
material in the Lindenberg Herbarium at Vienna. 
Spruce s specimens are scarcely larger than those of P. hetero- 
phyllus, but their leaves agree in shape with those of the type from 
Guiana, measuring about 0.75 mm. in width and scarcely more than 
that in length. The underleaves, too, are much broader than long 
and usually show distinct auricles. The free margin of the lobule, 
however, offers a few distinctive features, when compared with the 
type. Although the number of teeth is about the same, the apical 
tooth is longer than the others and extends outward, instead of being 
inflexed, a distinct sinus being thus formed between the apical tooth 
and the distal portion of the margin. The other teeth are inflexed, 
but not very strongly so. The branches with caducous leaves are 
^Linnaea24: 627. 1851. 
1" Hedwigia 33 : 7,/. 8-10. 1894. 
