INTRODUCTION TO CHYPTOGAMIO BOTANY. 449 



1. ANTHOCERIDEiE, Cord. 



Sporangium threaded by a linear columella, splitting longi- 

 tudinally on one or both sides ; frond without pores. 



491. This tribe consists of two or three genera distinguished 

 by the possession of a columella and by the sporangium not 

 splitting into four, as in the greater part of the order. Bendro- 

 ceros contains a few species peculiar to hot countries ; one is 

 claimed by Nees for the temperate clime of New Zealand, so 

 rich in Hepaticw; but this appears to be only a state of ^n- 

 thoceros laevis, while Dendfoceros Jamesonii, Tayl., is appa- 

 rently A. punctatus. Dendroceros differs from Anthoceros 

 in the sporangium being merely bifid at the apex, the fissure 

 extending down one side only ; but D. crispatus is sometimes 

 as deeply cleft as A. punctatus.* In A. Jainesonii, on the 

 contrary, the valves adhere at the apex. Anthoceros proper 

 has several species in temperate countries. Two of these occur 

 both in the north and south hemispheres. About half belong 

 to the tropics. Blandovia is a Podostemad, and has no rela- 

 tion to these Cryptogams. Garpobolus (Fig. 94, c) has shorter 

 sporangia than the other genera, splitting down one or both 

 sides, and is remarkable among Jungermcmnice for having no 

 elaters. The spores are said to be fixed to thick, somewhat 

 nodular, cords, springing from the columella. I have not been 

 able to observe this structure in a specimen of the original 

 species of Schweinitz, from Ohio, given to me by the kindness 

 of Sir W. J. Hooker, probably on account of its not being 

 sufficiently advanced. Two more species have been added by 

 Sullivant from the same country. 



2. Monocles, Nees. 



Sporangium bursting by a longitudinal fissure; columella, 

 none. Foliose or frondose. 



492. No recent opportunity has offered itself for the examina- 

 of Monoclea, in which, as Sir W. J. Hooker himself says, the 

 columella may have been overlooked. As, however, it is 

 equally possible that none may have existed, and as there is 

 another genus, Galobryum, destitute of a columella, it is well 



* See Fl. of New Zealand, p. 171. 

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