On the PiTHOPHORACEyE. ' 59 



erassis et 216 ,u altis, liiy c:a 70 /( crassis et 1(34 ,« altis; sporis teniiinalibus (non 

 rar« sessilibus) oreulreforuiibus, sursuni brevi-acuminatis apice rotuudato, c:a 9o j^i 

 erassis et 232 ,« altis.] 



Locality. Professor P. T. Cleve has found this interesting species in the 

 AVest-Indies, in the isle of S:t Thomas near Soldier-Bay on humid earth in the 

 shade of bushes. ') Oct. 1868. — Ei)iphytically on it grow two undescribed 

 monoecious species of (Jcdogonium, which it is my intention to describe in 

 another place. 



General Description. Fertile specimens. Caulo'ïd part of the thallus. 

 The ramifiL-atiun ol' this part is in P. Clevcana nob. somewhat more developed than 

 in P. kticoisis nob. Most specimens have, it is true, branches only of the hst 

 degree; but specimens with branches of the 2:d degree are far from being rare, 

 and in a couple of specimens I have seen branches even of the 3:rd degree, but 

 which have almost always consisted of onh' one sessile spore. The branches of the 

 2:d degree are generally very short. Not seldom those branches consists (like those 

 of the :-):rd degree) barely of one sessile spore; see pi. 4, fig. 13 ss. The principal 

 filament is, when it ends in a spore, often very short, sometimes scarcely 2 m.m. 

 long (])1. 2, fig. 13; pi. 4, fig. 16); the branches of the l:st degree in such speci- 

 mens are, it is true, longer, but uQt very much. Sometimes such little dwarf spe- 

 cimens are quite devoid of branches, and remind one then in a very high degree 

 of a gigantic Oalogonium with ellipso'idic oogouia. The branches are most fre- 

 quently single, but not seldom those of the l:st degree are developed two and two 

 from one cell and are then placed opposite, or almost so, to each other (pi. 2, fig. 

 13; pi. 4, fig. 16; j)]. 5, figs. 1 and 2). The normal branches in this species of 

 Pithopliora are placed, as in the others, a small space below the top of the sup- 

 jiorting cell, which si)ace is most frequently smaller than the diameter of the lowest 

 branch cell, but can now and then be even longer (])1. ö, fig. 2). Cells without 

 branches occur rather seldom, if you do not count the top cells'-,), the subsporal 

 iclls, and the cells belonging to the branches of the highest degree. The lowest 

 line cf the cells in the cauloïd part of the thallus is not seldom devoid of branches 

 (pi. 4, fig. 13 and 16j; sometimes, however, this cells carries more branches than 

 the (ithcr cells, supporting besides the one or two ordinary terminal branches, 

 an accessorial basal branch (])I. .5, fig. 1 and 6). Accessorial branches, most 

 frecjuently carrying helicoïds, are now and then found even on other cells (pi. 5, 

 fig. 1 ac). The comparatively frequent occurrence of helicoïds is particularly re- 

 markable in this species. Most specimens have one or more of these organs. These, 

 generally consisting of the transformed toj) of a terminal cell, occur in numerous 

 different shapes. Now they are unbranched (pi. 5, fig. 1 /fj, now forked, now 



') Aiiiûiig the C'iadoj^lioreœ two species, viz. Cladopliora Sayneana Mont, (from Cuba) 

 ;lii(1 (7. tomeiitosa Sur. (from Japan), are known to occur in similar localities. 



-) Top cells carrying brancLes are not, liowevev, quite \\itliout instances. In small 

 fertile specimens you sometimes find the top cell of the principal tilament, when it is a 

 spore, carrying' branches (pi. 2, fig. 13; pi. 4, fig. 16). 



