THE GENERA OF MOSSES. 
125 
of fructification form. Both kinds are sometimes present 
in the same plant ; both are endowed with a reproductive 
power, and are most abundant when the first kind of fruc- 
tification (the thecd) is least to be met with. 
Veg. " Plants of small size, of a more or less compact 
cellular structure, readily reviving upon the application of 
moisture, after being dry ; bearing leaves, which are very 
rarely divided, often nerved, entire, or toothed, or serrated 
at the margin.**"* The leaves, though sometimes so minute 
as to be invisible to the naked eye, are never totally absent. 
Gen. I. Andrjea, EJirhart. 
Fructificatio. Receptaculum baud pedicellatum, plus 
minusve elongatum, lineam vel sesquihneam longitudine 
superans, foliis perichaetialibus paulo longius, album, sue- 
culentum, vasculosum, cylindraceum, ad basin in bulbilli 
formam intumescens, ad apicem thecae apophysin sustinens. 
Calyptra tenuis, pellucens, albida, laxe reticulata, thecam 
juvenilem obtegens, basi receptaculum summum arete ad- 
nata ; demum ut theca evadat, subhorizontaliter et irregu- 
lariter disrumpens, valde fugax. Seta nulla, theca, vel 
potius apophysi ejus oblonga vel turbinata, fusca, substan- 
tia pulposa impleta, receptaculum insidente. Theca intense 
fusca, cylindracea, demum subquadrangularis, in quatuor 
valvas aequales longitudinaliter dehiscens ; quae exsiccatione, 
apicibus semper operculo connexis, operculoque per val va- 
rum involvescentiam detracto, in semicirculum eleganter 
arcuatse. Operculum (conjunctorium, Ehr.) minutum, co- 
nicum, obtusum, vel thecae concolor aut albescens. Peri- 
stomium nullum ob operculum thecae valvarum extremita- 
tibus cohaerens. Columella thecae fere longitudine, cylin- 
