Polytrichum.-} APLOPERISTOMI. 43 



by a horizontal membrane; Calyptra dimidiate, small. 



(TAB. I.) 



The teeth in this genus are short, incurved, obtuse, between 

 membranaceous and cartilaginous, their margins whitish, semi- 

 pellucid, their centres marked with a red longitudinal line ; and 

 the horizontal membrane which unites them appealing perforated, 

 (probably owing to its cellular texture) under a high power of the 

 microscope. 



The following extract from Wahlenberg will justify us in re- 

 jecting the division of this tribe into Polytrichum and Catharinea, 

 as adopted by Ehrhart and Mohr. " In hoc et plerisque Poly- 

 trichis pili calyptra? turn in apice ipsius calyptra turn in vaginula 

 inseruntur. Flos foemineus calyptra3 summitatem et vaginulam 

 continuas habet, utrasque filis succosis erectis cohaerentibus vesti- 

 tas. Post florescentiam in altum surgit summitas calyptra?, et 

 inferior pars elongatur simulque glabra fit, dum pili vaginula? cum 

 calyptra? pilis cohserentes elongantur demumque ab insertione evel- 

 lentur. Hinc quasi deorsum reflexi apparent pili; quod tamen 

 neutiquam sunt, dum antea inferne in vaginula inserti fuerunt- 

 De csetero pilositas calyptrse in diversis diversa : in P. hercynico 

 per totam calyptram sparsa, apud P. undulatum in apice tantum, 

 et apud P. Icevigatum omnino deest." 



* Calyptra naked. (Catharinea Ehrh.). 



1. P. undulatum ; leaves lanceolate undulate, the margins plane 

 denticulated, their nerve winged, capsule cylindrical curved, 

 lid subulate. (TAB. X.) 



Polytrichum undulatum. Hedw. St. Cr. v. 1. t. 16, 17. Turn. 

 Muse. Hib. p. 91. Smith, Fl. Brit. p. 1382. Engl JBot. t. 1220. 

 Schwaegr. Suppl. v. 1. p. 330. Funck, Deutschl. Moose, t. 57. n. 18. 

 Hobson, Brit. Mosses, v. 1. n. 13. Urummond, Muse. Scot. v. 2. n. 20. 

 Hook. FL Scot. P. II. p. 125. Am Disp. Muse. p. 72. 



Polytrichum angnstatum. Funck, Deutschl. Moose, t. 57. n. 19. 



Catharinea Callibryon. Ehrh. Crypt. 83. 



Catharinea undulata. Web. et Mohr. Moug. et Nestl. n. 131. 



Atrichum undulatum. P. de Beauv. 



Bryum undulatum. Linn Ditt. Muse. t. 46. / 18. 



HAB. Common on moist shady banks, and in woods. 

 16 



