[Vol. 9 

 108 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



row; megaspores white, creamy when wet, 400-500 p in diameter, 

 with few large warts on apical faces, more numerous on basal; 

 microspores 27-32 p in length, almost smooth. 



Distribution: Central Africa, Kingdom Djur. 



Specimen examined: 



Africa: Anglo-Egyptian Sudan, Jur Ghattas, 7N., under water, 

 June-July, 1869, Schweinfurth (Mo. Bot. Gard. Herb.). 



The habit is much like that of /. Boryana Dur. except for longer 

 leaves which are commonly coarser than those of the forms 

 7. velata and its allies, tenuissima, tegulensis, etc., as well as /. 

 setacea Bosc. It differs further from these forms in that the 

 velum is lacking, in contrast to being practically completely de- 

 veloped. The megaspores do not turn dark in moisture, as do 

 those of /. Boryana. 



The species can be delimited from 7. adspersa A. Br., which is 

 similar in lacking a velum, in that it has far coarser, as well as 

 longer, leaves, that the megaspores are larger (over 400 n rather 

 than with that aS a maximum), and that the microspores are 

 smooth rather than long spinulose. 



Contrary to Baker's and Motelay and Vendryes' description, 

 I find the megaspores large tuberculate, with such markings that 

 they might easily be confused with 7. Boryana Dur., 7. tegulensis 

 Genn., 7. tenuissima Bor., etc. I find no evidence of honeycomb- 

 ing in my material, part of which is from the herbarium of Mo- 

 telay himself. 



3.5 I. ovata Pfeiffer, n. sp. 1 



Corm 3-lobed; leaves 7-15, 6-24 cm. long, slender, tapering 

 to apex, with basal membranaceous margins but briefly extended ; 

 stomata present; peripheral strands lacking or six in number; 

 ligule deltoid, with broad base; sporangium small, ovoid, 2.54 

 mm. long, lacking a velum ; megaspores cream-colored, 520-830 p 

 in diameter, with high well-rounded large tubercles, seldom be- 

 coming somewhat vermiform; commissural ridges decidedly 



'I. ovata sp. nov. Cormus trilobntus. Folia numero 7-15, longitudine 6-24 cm., 

 angusta, versus apicem nttenuata, basi membranacea breviter dilatata, stomatibus 

 instructa et fibrosis peripherieis vel nullis vel numero sex instructa. Lingula tri- 

 angularis, basi lata. Sporangium ovatum, parvulum, longitudine 2.5-4 mm., sine 

 velo. Macrosporae gilvae, diam. 520-830 p, tubereulis erassis prominulis, raro ali- 

 quantulum verruculosis ornatae, costis commissuris teretibus, aliquando decussa- 

 tim rugosis. Microsporae longitudine 31-36 /j,, leviter reticulatae. 



