Marsupiocarpese 93 



a fleshy cup, which is apt to become turgid and gibbous at the rooting 

 base. A further extension downwards results in a pouch, which buries 

 itself in the matrix.* 



Thus, Acrobolbus Nees {=Gymnanthe Tayl. pro p.) is the direct con- 

 tinuation of such NardiiB (AUcularice) as N. hamatosticta (N.), N. Lescurii 

 Aust. and N. BreidUri (Limp.), whose gibbous, rooting involucre is the 

 precursor of the pendulous bulbiform pouch of Acrobolbus Wilsoni; while 

 the vegetative organs are of the same type in both genera. Southbya 

 S., as to its stem and foliage, is the exact antitype of Calypogeia Eaddi 

 {^=Gongylanthus l^.=^Podanthe Ta,jl.=:Lindigina Gottach..=Lethocolea 

 Mitt. =:Gymnanthe, ex p. Syti. Hep.). It has the same fragile stems, 

 creeping by numerous pale radicles ; the opposite, densely-packed, broad 

 and tender leaves, which are usually rounded or retuse at the apex, 

 more rarely obsoletely 2 — 3-dentate, or paucidenticulate. In both genera 

 the involucre adheres at the base to the perianth ; only in Calypogeia 

 it is prolonged, into a pouch. So great is the external resemblance be- 

 tween the.two genera, that, when I found two species of Calypogeia in 

 the Andes, I at first unhesitatingly referred them to Southbya ; and it 

 was not until some time afterwards, when I had succeeded in disinterring 

 the subterraneous pouches, that I ascertained the true affinity of the 

 species. In every Calypogeia I have bjeen able to examine, the calyptra 

 is perfectly free from the perianth, in which the genus differs essentially 

 from Acrobolbus, whose calyptra is adherent ; besides that the leaves of 

 the latter are alternate, loosely set on the stem, and rather deeply bifid 

 or trifid, as in Nardia Lescurii, N. Breidleri, Jung. (Lophozia) capitata, 

 dc.\ 



* See also Gottsche's admirable memoir "On the fructification of the Jung^manicB Geocalycea," 

 in the 21st volume of the Transactions of the Imperial German Academy " Naturas Curiosorum." 



+ I add a list of all the species of Calypogeia at present known to me. 



C. ericetorum Raddi. Species Europaeae 



C . flageUif era Ks-Adi. • \ 



C. Liebmanniana ("Gottsche, Lindigina). Mexicanae : ^ 



C. Mullen (Gottsche, Lindigina). 



C. Granatensis (Gottsche, Lindigina). Andinae : 



C. oniscoides Spruce. 



C. euthemona Spruce. 



C. Bustillosii (Mont., Gymnanthe) 



