b8o 



Acrolejeunea orchidœ, n. sp., Pkars. (Fig. III). 



Monoicum vel autoicum. Magnitudo inedia, color a pallida ad luscain ; conicalis. Caulis 

 dichotonius, ranii irref;ulares, curvati non recti, laiitudinis 6 ccllulaïuni ; radicolosus, radi- 

 culi usque ad nicdielalcm quorunidani raniorum ascendeniis ex base foliorum inferiorum 

 per 6 procedentes, tilanienta alba spurca. Folia patcntia (50') imbricala, convexa, rolunda, 

 subfalcata; apex rolundatus; margina intégra, niargina anlenur caulem paulo excedens, 

 inferior vero b;e])e incurvata; cellulie parva-, rolundaloquadiaia'. nienibrana crassa, angula 

 accrescentia absque irigonibus. Lobulus laïus, ter circiter lobo minor, oblongus, angulus 

 liber acutus vel dtntalus in niedio lobuli ; in base lumidus, ci.rtna jilana. pais superior com- 

 planala. Kolia inleriora quater caule ampliora, imbncaia, oibiculaia, kmgiiudo laliludine 

 minor, apex sape recuivatus. Flores Ç in ramis parvis lerniinalibus, sine innovationibus. 

 Bractea: lobus, ovalo-falcalus, acutus, integer ; lobulus bis vel itr lenuioi, lanceolatus, 

 acutus, inleger. Perianthus perfectus invisibilis. Anientula 12 pares bractearum : bracteae 

 lobus ovatus, apex obtusus; lobulus parum tenuior, apex acuius, bracieolus oibiculatus. 



Monoicous or autoicous. Médium size; pale to leddish biown in colour; 

 corticolous. Stem dichotomous, branches irregular, ciir\ecl, uot straight, 

 6 narrow cclls wide; radiculose, rootlets ascendirg to tle middle of some 

 branches, proceediug from the base of underleaxts in bi;ncl.es ol about 

 6 thick, dirty white tnreads. Leaves patent (50'), inibricate, convex, rotund; 

 sub-falcate, apex rotundate, margin entire, autical (uppen miirgin projecting 

 a little beyond the stem, olten narrowly recurved; postical (lowerj margin 

 fréquent!}' incurved; cells small, roundish-quadiate, walls Ihick. angles 

 thickeued, no trigones; lobule large, about i 3 ul. tmallcr than the Icbe, 

 oblong, free angle acute or with tooth middle of ihe lobule; tumid below, 

 keel smooth, u])per portion complanate. Underleaves 4 timts broader than 

 the stem, imbricate, orbicular, broader than long, apex olten recurved. 

 Female flowers on short terminal branches, without innovations; bracts, lobe 

 ovato-falcate, acute, entire; lobule 2 to 3 tinies smaller, larceolate, acute, 

 entire: perfect perianth not seen. Amentula 12 pairs of bracts; bracts, lobe 

 ovate, apex obtuse, lobule rather smaller, apex acute, br<;cteole orbiculate. 



Dimensions : Stem i inch long; .1 mm. diam.; with leaves 15 mm. wide; 

 leaves lobe i. mm. x .75 mm , lobule .3 mm. x .15 mm. cells .02 mm.; 

 underleaves .3 mm. x .35 mm.; bract. lobe i.i mm. X- 6 mm. lobule 

 .9 mm. X .2 mm.; bracteole .7 mm. X .5 mm., maie bract, lobe .5 mm. 

 X .3 mm., lobule .4 mm. x .2 mm. ; maie bracteole .3 mm. x .4 mm. 



Obs. : Differs from Stephani's description of his Ptychocoleus {Acrole- 

 jeiaiea) Yanderxsiii, in the lobule of the leaf not being biapiculate, under- 

 leaves not reniforra, 4 times broader than the stem, bracts, lobe acute not 

 rotundate, obule acute uot obtuse. 



Hab. : Nlemfu, on the well. 4-VII-19 (R. P. H. Vanderust). — On Orchid 

 roots, in the mountains near Nandia, Ùele, Ituri. 4-X-16 (M. Lacomblez). 



