54 ARKIV FÖR BOTANIK. BAND 1. 



In some of my specimens there is a slight difference as 

 to the number of venules; these are very crowded in a spe- 

 cimen from French Guiana, fig. 31, A (collected by Sagot); 

 less crowded in specimens from Cuba, fig. 31, C (Wright, 

 n. 952 ex parte; the rest is Tr. Uneolatum, see below!), and 

 rather sparse in my Brazilian specimens, fig. 31, B. 



Tr.punctatum is generally a very minute plant, the roundish 

 (orbicular or reniform) fronds being only 4 — 6 mm in length 

 (the involucres included). The frond is only slightly waved 

 or lobed at the margin, but more often cut into minute roun- 

 dish teeth or lobules. The margin has larger and more nu- 

 merous hairs, than in Tr. sphenoides. In this respect, as 

 well as on account of its very large involucre, this species 

 comes nearer to Tr. pusillum. 



I collected Trich. punctatxm (a form with rather sparse 

 venation) in Brazil, Matto-Grosso, on trees in the primeval 

 forest called »Poaia», 13th April 1894, Exped. 1. Regnell., 

 n. A, 2903. 



13. Trichomanes lineolatum Hook. — Fig. 30 B, 31 D, E. 



Hooker and Baker, Synopsis Filicum, ed. 2, 1883, p. 73. 

 Didi/moglossum lineolatum Van den Bosch, Hymenophyll. no- 

 vas .. ., Xederl. Kruidk. Archief, 5:2, 1863, p. 136. 



Syn. Diclymoglossum laceratum Fee, Filices Antillanae, 1866, t. 32, 

 f. 1. 

 » Sloane, A Voyage, t. 27, fig. 1? 



In connection with Tr. punctaium I mention briefly the 

 very imperfectly known Tr. lineolatum (V. D. B.) Hook. No 

 illustration exists of this species, except Fee's ^Didym. lacera- 

 tum» (1866), quoted above, which seems to answer perfectly 

 to lineolatum. This species is very different from the others 

 of Didymoglossum, and its peculiarities are very well ex- 

 plained by Van den Bosch in the original description: » fir- 



miuscule rigida — — costa a basi inde in venas simplices 

 furcatasve flabellatas valde approximatas soluta ». 



According to these marks, I think I am correct in re- 

 ferring Wright's plant from Cuba, n. 952, to Tr. Uneolatum 

 (a portion of his collection n. 952 is Tr. punctatum, see above), 



