Ctenitis

Kessler, Michael, Moran, Robbin C., Mickel, John T., Matos, Fernando B. & Smith, Alan R., 2018, Prodromus of a fern flora for Bolivia. XXXV. Dryopteridaceae, Phytotaxa 353 (1), pp. 448-450 : 448-450

Key to the Bolivian species of Ctenitis

1 Blades 2-pinnate-pinnatifid to 4-pinnate ............................................................................................................................. C. ampla

– Blades 1-pinnate-pinnatifid, at least above the proximal pinnae ..................................................................................................... 2

2 Ultimate segments (at least of proximal pinnae) crenate; blades lacking marginal cilia; veins of crenate segments often 1-forked. ....................................................................................................................................................................................... C. nigrovenia

– Ultimate segments entire or nearly so; blades with scattered to abundant marginal cilia, at least in segment sinuses; veins simple. ........................................................................................................................................................................................................... 3

3 Indusia present, subpersistent, pubescent; tissue between veins abaxially and/or adaxially minutely pubescent; basal veins ending at the segment margins, well above the sinuses ..................................................................................................... C. microchlaena

– Indusia lacking or minute; tissue between veins glabrous or glandular; basal veins ending short of the segment margins or reaching it at or near the sinuses ..................................................................................................................................................................... 4

4 Pinnae incised 1/4–1/2(–2/3) to the costae; veins and often tissue between veins abaxially with minute, scattered, yellow or reddish glands; rachis and costal scales entire, not or obscurely clathrate ................................................................................ C. refulgens

– Pinnae incised 2/3–3/4 or more to costae; veins and tissue between veins abaxially lacking glands; rachis and costal scales entire to remotely denticulate, clathrate ..................................................................................................................................................... 5

5 Pinnae incised ca. 2/3 the way to costae; pinna segments 5–9 mm wide at costules, blunt or obtuse at tips; costal scales ovate, blackish .............................................................................................................................................................................. C. nervata

– Pinnae incised ca. 3/4 or more to costae; pinna segments 3–5 mm wide at costules, obtuse or acutish at tips; costal scales lanceolate, brownish ................................................................................................................................................................ C. submarginalis