302 56 



A very distincl and pretty new species, differing from the other creeping spe- 

 cies by its suddenly reduced l)ipartite lower pinnæ, by its pale colour and whitish 

 pubescence. 



40. Dryopteris pseudomontana (Hier.) C. Chr. Index 286. 1905; Rosenstock, Hed- 

 wigia 46: 126. 1906; Hieron. Hedwigia 46: 344. 1907 — [P^ig. 28]. 



Syn. Aspidium pseudomontanum Hieron. Engl. Jahrb. 22: 373. 1896; Nephro- 

 dium pseudomontanum Rosensl. Hedwigia 43: 225. 1904. 



Type from Argentina, leg. Niederlein n. 237 (HB). 



Brazil: Prov. Rio Grande do Sul, Jürgens (HB), Schmalz n. 45 (HR). — 

 ?Glaziou n. 4434 (HB. HC. HH. HS). 



Also recorded from an island in the lake Titicaca. 



A rather faintly characterized species, possibly best marked by its subdeltoid 

 shape of the pinnæ. In the two specimens examined as a rule only the lowest 

 anterior vein of the segment bears a sorus, while in the specimen leg. Glaziou the 

 majority of veins are soriferous. This specimen differs also from the others by its 

 dark colour and closely placed segments. The lamina narrows downwards gra- 

 dually through upto 6 pairs of distant auriculiform pinnæ. 



41. Dryopteris rivularioides (Fée) C. Chr. apud Rosenstock, Hedwigia 46: 125. 



1906. — [Fig. 29]. 



Syn. Aspidium rivularioides Fée, Cr. vase. Brés. 1: 148 tab. 50 fig. 1. 1869. 

 Nephrodium pseadothelypteris Rosenstock, Hedwigia 43:225. 1904; Dryopteris psendo- 

 thelypteris C. Chr. Ind. 286. 1905. 



Type from Southern Brazil (Rio?); leg. Glaziou n. 2358 (HH. HS!). 



Besides the specimens mentioned by Rosenstock in Hedwigia 43 and 46 I have 

 examined the following, all from Southern Brazil : 



Glaziou n. 6966 (HS), 7266 (HH. HB), 22634 (Goyaz, HB). — Minas Geraes: 

 Caldas, Regnell n. III. 1446 a (HS); Mosén n. 2166, 2169, 2178, 2179 (HS). — Friburgo, 

 R. Mendonça n. 394 (HB). — Rio, P. Dusén (HC). 



This A'ariable species is probably very common in southern Brazil and till 

 recently confounded with D. opposita, from which it differs not only in habit but 

 also in important characters, as e. g. the wide-creeping rhizome and its often fur- 

 cate veins. I have nothing to add to Rosenstock's excellent descriptions. There is 

 no doubt that Nephr. pseudothelypteris Ros. is the same as Aspid. rivularioides Fée. 

 The original specimens seen of this latter show a long narrow form, while N. 

 pseudothelypteris in its most developed form is a large broad-leaved plant with the 

 segments often lobed. 



As a somewhat more different form but in all essential characters agreeing 

 very well with the type, 1 refer hereto as a variety: 



var. Arechavaletae (Hieron.). 



Syn. Aspidium Arechavaletae Hieron. Engl. Jahrb. 22: 370. 1896; Dryopteris 



