— B 86 — 



Prionolejeunea Corbisieri, n. sp., Peaks. (Fig. \'^I). 



Monoicum. Magniludo tcnuis; color viridofusca; caespitosum. Caulis irregulariter pin- 

 nalus. Folia horizontalia (90), vel patento-divergentia (70»), oblonga; margo anterior in 

 parte superiori qu:c caulein cooperit; basis posterior suberccta. Cellulii' parva- 4,5 vel 6 

 lacius habentes; nieiiibran:i; incrassat:e, sine trigonis. Lobulus parvus, rotundato-quadratus, 

 angulus liber acutus. 



Folia inferiora parva, ter caule largiora, ovata, orbiculata, angulosa vel admantiforma, 

 per circa '/i bifida; segmenti acuti. 



3racie<e : Lobus ovatus, apex oblusus vel rotunJatus; lobulus lanceolatus, acutus. Brac- 

 teolus ovatus per circa '/» bifidus; segmenti et sinus acuti. 



Perianthus in ramis brevibus oblongo-pynformis, faciès anterior plana; posterior plus- 

 nunusve obluso-carinala. anguli plani, rostellalus. 



.\mentula, elongala : bracteiu (4-6 pares) deus:e vel remotx; bracteie (j* : lobus ovatus, 

 apex obtusus; lobulus, plusminusve minor, ovatus, apex obtusus; carina subpapillosa. Sine 

 bracteolis. 



MoQoicous. Small : dark greenish browii; caespitose. Stems irregularly 

 piniiate. Leaves horizontal (90") to patent-divergent (70"), oblong. antical 

 (upper) margin covering tlie stem, postical (lower) some what straight; cells 

 small, 4, 5 and 6-sided, walls thick, no trigones : lobule small, rotund- 

 quadrate, free angle acute. Underleavos small, 3 times broader than the 

 stora, ovate, orbiculate, angular or diamond-shaped : bifid to about ',3 rd. 

 segments acute. Bracts, lobe oval, apex obtuse or rotundate, lobule lan- 

 ceolate, acute. Bracteole oval, bifid to about 'g th., segments acute, sinus 

 acute. Perianths on short branches, smooth; rostcllate. Araentula long, 

 4-6 pairs of bracts, approximate or distant, cf bracts, lobe oval, apex obtuse ; 

 keel slightly pai)illose. No bracteoles. 



Dimensions : Stem ';., to ' ^ inch long, .05 mm. diam.; with leaves .75 mm. 

 wide; leaves, lobe .5 mm. X 4 mm. lobule .125 mm. X .125 mm.; cells 

 0.2 mm.; underleaves .175 mm. X .15 mm.; segm., .075 mm.; .2 mm. 

 X .175 mm., segm. .05 mm. ; bracts, lobe .6 mm X .35 mm., lobule .35 mm. 

 X .1 mm., .4 mm. X .25 mm., lobule .2 mm. x 075 mm.; bracteole .4 mm. 

 X .2 mm., segm. .05 mm.; perianth .6 mm X 4 mm., .45 mm. X .3 mm.; 

 amentula 1.25 mm. long. X .3 mm.; maie bracts, lobe .25 mm. X .2 mm., 

 lobule .175 mm x .125 mm. 



Hab. : lu cortices, on orchid roots, Eaia. 8-IX-19 (M. Corbisier). 



Obs. : This species differs from most of those belonging to Prionolejeunea 

 in having a smooth and not a fringed perianth. 



/-*. exannata, Sr , from .\frica, is another; it differs from P. Corbiesierim 

 having larger leaves .g mm. x .6 mm , not .5 mm. x 4 mm , larger and 

 différent shajied underleaves, obovate perianth, with loug beak, lobule 

 of I)ract larger, bracteole bifid to the middle. 



