[Vol. 9 



108 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



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

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

 microspores 27-32 \i in length, almost smooth. 



Distribution: Central Africa, Kingdom Djur. 



Specimen examined: 

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



June-July, 1869, Schweinjurth (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 

 /. vclata and its allies, tenuissima, tegulensis, etc., as well as /. 

 setacca 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 /. adspcrsa 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 m rather 

 than with that ad 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 /. Boryana Dur., /. tegulensis 

 Genu., /. 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, G-24 cm. long, slender, tapering 

 to apex, with b::sal membranaceous margins but briefly extended; 

 stomata present; peripheral strands lacking or six in number; 

 ligulo deltoid, with broad base; sporangium small, ovoid, 2.5-4 

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

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

 coming somewhat vermiform; commissural ridges decidedly 



l h ovata Bp. nov, Cormus trilobatus. Folia numero 7-15, longitudine G-24 cm*, 

 angusta, v reus apicem attenuata, basi membranacea breviter dilatata, si natibus 

 instructa el fibrosis periphericis vel nullis vel numero sex instructa. Lingula tri- 

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

 velo. Macroeporae gilvae, diam. 520— 830 /i, tuberculis crassis prominuliSj raro ali- 



quantulum verruculosis ornatae, costis commissuris teretibus, nliquando decussa- 



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





