28 ERYTHEA. 
tomous, with oblong segments, creeping among mosses, 
observed in Ireland by Mr. Sherard,” is referred by Lind- 
berg to Metzgeria furcata—a determination that can scarcely 
be questioned, at least so far as the genus is concerned. 
Lichen parvus, “creeping on the moist bark of trees, with 
subrotund leaflets incumbent in the manner of scales,” may 
easily be Radula complanata, as determined by the same 
author. “From the extreme leaflets or scales,” in this, 
“arise very short and slender pedicels sustaining subrotund 
capitula, which, dehiscing into four segments, resemble little 
tetrapetalous flowers, of a reddish color.” In addition to 
these already specifically mentioned, our older friends, 
Marchantia, Conocephalus, Pellia, and Lunularia, have a 
place here; also a Lichen verrucosus, which was probably a 
male Conocephalus, and a Lichen seminifera pyxide folio 
adnascente Julo pediculo longo insidente, gathered on the 
walls of the old church in the Savoy, which Mr. Doody, a 
friend of Ray’s and “a botanist of the first rank, not only 
very diligent in seeking out plants, but also most acute in 
discerning their differences and distinguishing species,’’® con- 
sidered to be a form of M. polymorphu.? Then there are 
the three species of Mr. Doody in the Appendix of the 
second edition of the Synopsis (p. 339). The first of these 
is “the narrower Muscus lichenoides, with leaves incumbent 
upon the stem in the fashion of scales.” He says this is 
nearest the tenth species described by Ray (supposed to be 
Radula complanata) but the branches are two or three times 
narrower. The second is “the greater Muscus lichenoides 
with pinnate bifid leaves,’ and the third, “the less Muscus 
lichenoides with pinnate bifid leaves.” In all these a capit- 
ulum arises from a little tube seated on the leaves and 
finally dehisces into four parts. These brief diagnoses have 
been traditionally interpreted as applying respectively to 
Frullania dilatata, Lophocolea bidentata, and Cephalozia 
bicuspidata. 
6Ray, Syn. Meth. Stirp. Brit., p. 327, ed. II. 
TRay, Syn. Meth. Stirp. Brit., p. 115, ed. ITI. 
