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6. Cololejeunea Camilli (Lehm.) comb. nov. Lejeunea Camilli Lehm. 

 Pug. Plant. 10: 15. 1857. Lejeunea (Colo-Lejeunea) Montagnei Lehm.; 

 Stephani, Hedwigia 29: 96. 1890. Not Lejeunea Montagnei Gottsche, now 

 Euosmolejeunea Montagnei (Gottsche) Steph. (Figures 6-14.) 



Collected in July, 1903, near Mabess River, Jamaica, on living leaves, by 

 the writer (No. 280). The determination is based on a fragmentary specimen 

 in the herbarium of the British Museum, collected by Ule in Brazil {No. 260) 

 and determined by Stephani as Cololejeunea Montagnei, a name which has never 

 been formally published. The type specimen of L. Camilli is unknown to the 

 writer, and the same thing is true of the type specimen of L. {Colo-Lejeunea) 

 Montagnei. It should be noted, however, that both specific names were given 

 by Lehmann, that both were applied to Cuban specimens obtained from Mon- 

 tagne, and that the original description of L. Camilli agrees in all essential re- 

 spects with Stephani's description of L. {Colo-Lejuenea) Montagnei. It is prob- 

 able that Lehmann first called the plant L. Montagnei in his manuscript and then, 

 upon learning that the same name had already been applied to another species, 

 altered the name in his published paper to L. Camilli, thus using the Christian 

 name of Montague instead of the surname. Apparently Stephani overlooked 

 Lehmann's description and, upon recognizing the distinctness of the species, 

 pubHshed it under Lehmann's original manuscript name. Unfortunately the 

 writer has been unable to establish these ideas conclusively. According to 

 Stephani the species occurs in Mexico as well as in Cuba, so that it is evidently 

 widely distributed in the American tropics. 



The Jamaican specimens referred to C. Camilli grow scattered or in de- 

 pressed mats, the plants rarely overlapping. The stems are very delicate, 

 measuring about 0.03 mm. in diameter, and are either simple or sparingly and 

 irregularly branched, the branches spreading widely. The leaves are distant 

 or contiguous and spread more or less from the axis (figs. 6-8). The lobes vary 

 from ovate to lanceolate, tapering toward both base and apex and attaining a 

 maximum size of about 0.7 x 0.25 mm. They are characterized further by being 

 scarcely or not at all falcate and by having an entire margin and an acute or 

 obtuse apex, usually tipped with a single cell (fig. 10). The lobule is almost 

 always reduced to a minute basal fold. When fully developed (fig. 7) it is ovate 

 and inflated and measures about 0.2 x o.i mm. Under these circumstances 

 the apical tooth consists of a single cell with a hyaline papilla at its base but on 

 the inner surface (fig. 11). The cell is in direct union with three cells of the 

 lobule, one of which is connected also with the blunt proximal tooth, usually 

 consisting of two projecting cells side by side. The leaf-cells average about 

 14 Ai along the margin of the lobe and 25 x 14 /i in the median and basal regions. 

 The walls are everywhere thin and destitute of trigones. 



The inflorescence seems to be constantly dioicous. The female flower 

 terminates the main stem or a leading branch and innovates on one side (fig. 6), 

 the innovation apparently continuing the female axis and sometimes bearing 

 a second archegonium. In rare cases two subfloral innovations are produced. 



