163 215 



Stipes fasciculated, up lo 25 cm long, glabrous. Lamina papyraceous, narrow- 

 lanceolate, 30 40 cm long, 4 — 10 cm broad, pinnate about to the middle, upwards 

 gradually tapering into a long pinnalifid apex. Lowest pinnæ considerably short- 

 ened, larger ones sessile and the upper adnate to rachis, distant, opposite, 3 — 5 cm 

 long, I'/icm broad, obtuse, shallowly serrulate. Rachis, costæ and veins beneath 

 rather densely setulose by long, rigid hairs and with fewer short, stellate hairs; 

 leaf-tissue of upper-surface minutely pubescent by adpressed hairs of under-surface 

 glabrous, not verrucose. Veins |)rominent beneath, 3 — 4 to a side, those of the basal 

 pair much upcurved and generally united before reaching sinus. Sori inframedial, 

 mostly confined to the anterior basal vein. Indusium subpersistent, setose by simple 

 hairs. Sporangia glabrous; receptacle setose. 



213. Dryopteris dissimulans Maxon et C. Chr. n. sp. 



= D. scolopendrioides (L.) O. K. x D. sagittata (Sw.) C. Chr. .' 

 Tj'pe from Cuba: Arroyo de Pedro, ad Jaguey, 600 m., Eggeks nr. 4958 (W!) 

 Rhizomate ereclo, dense radiculoso, squamis brunneis sparse stellato ciliatis 

 onusto. Stipitibus fasciculatis, 3 — 5 cm longis, strictis, minute stellato-pulverulentis 

 et sparse squamosis. Lamina ad 30 cm longa, supra medium 4 cm lata, versus 

 apicem breviter acuminata, versus basin longe et gradatum attenuata, coriacea, 

 griseo- viridi, ad medium pinnata, supra medium fere ad rachin pinnatifida. Rachi 

 tereti, stellato-puberula. Pinnis liberis multijugis sensim reductis, inferioribus 2—3 

 mm longis et latis, omnibus l)asi ulrinque subauriculatis, adnatis; scgmentis supra- 

 medialibus ad 2'/:; cm longis, a basi, 6 mm lata, versus apicem acutum sensim 

 attenuatis, parum obliquis, sinubus acutis separatis, supra glabris, infra prasertim 

 ad costas venasque breviter stellato-puberula. Venis bi-trifurcatis, ramis versus 

 marginem non raro anastomosantibus. Soris parvis, in segmento biserialibus, fere 

 medialibus. Indusiis parvis, stellato-cilialis. Sporangiis glabris. 



In general I am not inclined to consider a form intermediate between two known 

 species a hybrid between them, but in this case I am not far from believing that 

 the present plant is a hybrid between D. scolopendrioides and 1). sagittata. In almost 

 every respect it is exactly intermediate between the two species. In the presence of 

 an indusium and in cutting it resembles the former species, in the shape of the 

 segments and in the large number of downwards gradually dwindling pinnæ, which 

 show a tendence to becoming aui'icled on both sides at base, it is very like the 

 latter. In venation it is also intermediate. Hereto comes the fact that the spo- 

 rangia are partly abortive and do not produce spores, and further that Eggers has 

 gathered both true Ü. sagittata (nr. 4950) and D. scolopendrioides (nr. 4887) in the 

 same locality. From D. guadalupensis (Wikstr.) D. dissimulans differs by coriaceous 

 texture, grey-green colour, somewhat verrucose under-surface, by the large num- 

 ber of free and closely placed pinnæ and by the basal veins rarely being goni- 

 opteroid. 



28* 



