32 



ARKIV FÖR BOTANIK. BAXD 1. 



very near quercifolium Hook, et Grev. : the frond is 4 — 4,5 cm 

 in length; it is cuneate at the base, and in a fully developed 

 state it is pinnatifid about half way down to the costa; the 

 segments are relatively broad, entire or a little crenate, obtuse 

 at the apex, and separated from each other by a sinus of very vari- 

 able form, or sometimes imbricated. The caudex or rhizome is as 

 robust as in Tr. quercifolium, fig. 7, and Tr. Kraiissii, fig. 11. 

 The involucres are numerous, each placed at the emarginate 

 end of a segment. 



These observations are made on the authentic specimens 

 from Jamaica in Herb. Swartz (named -»reptans^' by Swartz's 

 own hand). I have taken the drawings in my üg. 17 and 

 18 from the same specimens. 



The best characteristics 

 for Tr. reptans are supplied 

 by the veins and the cells 

 of the frond. The costa 

 is much thicker than in 

 Tr. Kraussii and quercifo- 

 lium, nearly straight or 

 sometimes slightly flexu- 

 ose; the secondary veins 

 are not nearly so strong 

 and distinct as in all the 

 preceding species, much 

 exceeded in breadth by the 

 costa, and run in a very 

 acute angle from the latter, 

 as do the veinlets also; the spurious veinlets are very nu.- 

 merous. crowded and more continuous than in any preceding 

 species. 



The cellular structure, iig. 17, is a little more finely re- 

 ticulated than in any of the species mentioned above. The 

 walls as to thickness are intermediate l^etween Tr. Kraussii 

 and the following (pusillum, sphenoides). They are 0,oo4 — 0,oo7 

 mm thick (fig. D, E). In this species, the cells are arranged 

 in very distinct rows, owing to the crowded parallel veinlets. 

 Tr. reptans does not appear to be widely spread. Area: 

 West Indian Islands and northern parts of South America 

 (Columbia, Venezuela). 



Fig. 18. Trichomane^ reptans Sw., apex of 

 a large frond from Jamaica, the original spe- 

 cimen in Herb. Swartz (X 5). 



