12 ARKIV FÖR BOTANIK. BAND 1. 



These species are included in § Eudidymoglossum (ex 

 parte) Presl, ^ Didymoglossum Van den Bosch, ^ and Hemi- 

 phlebium, as this is limited by Prantl.'^ 



1. Trichomanes hy menoides Hedw. — Fig 1—3, 6. 

 Hedwig, Filicum geuera et species, 1799, t. IV, f. 3. 



Syn. Tricliomanes rnuscoides Swartz, Flora Indiae occidentalis, 

 III, 1806, p. 1726; Synopsis Filicum, 1806, p. 141. 

 » Trich. apodum Hook, et Grev., Ic. Fil., 1829, t. 117; 



Hook, et Bak., Syn., p. 75. 

 » » rnuscoides Sw., Flora Brasil, f. 23, 1859, p. 278, 



t. 18, f. 4. 

 » Didymoglossum muscoides Desv., Mém. Soc. Linn. Paris, 



6, p. 330. 

 » ■» » » , Presl, Hymenophyll:ae, 



1843, p. 23. 

 » » » Presl, and Didym. apodum 



(Hook, et Grev.), and Didym. Schafneri (Schldl.), V. 

 D. B. Synopsis, 1859, p. 40 (380). 

 » Hemiphlehium, muscoides Prantl, Die Hymenophyllaceen, 

 1875, Taf. IV, Fig. 59 A. 



(Non Trichomanes muscoides Hook, et Grev., Ic. Fil.^ 

 t. 179, neqne Hook, et Bak., Synopsis Filicum ed. 2. 1883, 

 p. 75. 



Amongst the small Trichomanes this is probably only 

 recognized by its few and distant veins. The central costa 

 is relatively thick; the secondary veins run out at short 

 distances from each other from the base of the costa, forming 

 about half a right angle to the costa, each of them going to 

 a main lobe and reaching a considerable length, but forked 

 only in a few branches. The spurious veinlets are only seen 

 near the apex of a lobe and are few, short and interrupted. 



The shape of the frond is generally recognized at once, 

 but not in all cases. The common form is broadly rounded 

 with a few very dilated lobes, fig. 1; this is brilliantly 

 represented by the illustration of ^Tr. apodum'» Hook, et Grrev., 

 Ic. Fil., t. 117; and most characteristic are the prolonged,^ 

 thickly tomentose caudex (rhizome) and the reniform, slightly 



^ Presl, Hymenopliyllaceae, 1843, p. 23. 



^ Van den Bosch, Synopsis Hymenophyllaeearum, 1859, p. 39 (or 379'). 



^ Prantl, Die Hymenophyllaceen, 1875, p. 45. 



