193 
also indicate the variability of the American species, though the 
variations are not constant enough to be specific, and hardly 
sufficient for varietal rank. For the sake of the argument the 
original descriptions are quoted: 
Gymnostomum turbinatum Michx. 
‘‘G, brevicaule simplex: foliis lanceolatis, apiculatis, serrulatis 
oe oblongiuscule turbinato ; operculo convexo, submamil- 
ato. 
“Habitus et magnitudo G. pyriformis ; pedunculo longiore; 
Sporangio excusso operculo magis truncato minusque crasso. 
“Hab. in Carolina inferiore.” : 
“Gym. dilatatum Beauv. Caule simplici erecto foliis spathulatis 
apici serrulatis, pyxidis pyriformis orificio magno, patulo.” 
~ 
“ Amerique Septentrionale.” 
“J. ’ai rapporte cette espece des Etats-Unis d’Amerique 
(Caroline du Sud), elle est remarquable par l’orifice large et trés- 
Cuvert de l’urne; du reste elle a le porte du Gym. pyriforme. 
Elle croit dans les liedx inondés.” = 
“ Gym. splachnoideum Beauv. caule simplici erecto ; foliis ovato 
lanceolatis, serrato-dentatis, acuminatis, costa integra notatis, 
Pyxidibus oblongis.” Amerique septentrionale. 
“Je lai trouvée dans le nouveau Jersey: elle differe du Gym. 
AS eine par la forme de l’urne, qui est comme étranglée au 
Milieu.” 
“ Gymnostomum Physcomitrium tortipes (Bernh. Brid.) caule 
‘recto simplici, foliis ovato-lanceolatis concavis strictis subpatenti- 
uS, pedunculo gracili flexuosissimo, thece turbinate superne 
Coarctatee operculo umbonata.” 
In America septentrionali circa Philadelphiam habitat. Clar. 
Bernhardi communicavit. | 
“Specie, ut videtur, distinctum a G. furbinato, quod theca oe 
forma «mulatur, pedunculo nullatenus crasso stricto, sed valde : 
“XuOsOo, presertim in statu sicco ita ut theca nutet, unciale, 
longior &. A splachnoideo autem differt theca non in medio sed 
pice coarctata, ut et pedunculis duplo longioribus, gracilioribus, 
contortis; ab utroque tandem foliis strictis, aqua sese pulchre ex- 
Plicantibus. Rete vasculosum etiam diversum. 2 : 
Through the kindness of M. Bescherelle and M. Franchet,I _ ne 
have been permitted to examine Michaux’s types of Gymnostomum 
i ee a wae 
turbinatum. Three specimens were sent to me from Richard's 
: herbarium in the Musée d’ Histoire Naturelle at the Jardin des 
Plantes, They were collected by Michaux, and are undoubtedly 
