603 



FILICES. 



vexa, oblonga ; venula? apice originem ducens, exterius dehis- 

 cens. 



Sori, summi pinnae cujusque ut etiam pinnulae cujusque, 1 

 seriati vel adpar unicum redacti. Indusium exterius, inte- 

 rius dehiscens obreflexionem in internum equitans. 



Thecae stipitatse ; venulae apice insidentes ; gyratae in spo- 

 rula argutata. 



Indusii cellulae sinuosae ; interiorly quid etiam tenuius, cel- 

 lulae ob ejus elongationem longiores, venula sorifera semper 

 simplex. 



Legi in ripas rivuli Manmoo, January 20, 1836, occurrence 

 videtur inter Theam. Prope Nigrigam, Feb. 21, 1836. 



D. assamica, Griff. Frondibus supra decompositis, foliaceis 

 nutantibus ; stipite rachibusque supra pubescento hirtis, subtus 

 arachnoideis, laciniis oblongis crenato-serratis, subtus glaucis, 

 subtus soris 2 vel 1 seriatis, involucris glabis, valvula exteriorj 

 minori. It. Ass. 319 



1. Portion of a frond, shewing the sori in situ. 



2. Ditto, ditto, back of the sori are generally much less evi- 

 dent on the margin next the axis, than the contrary. 



3. Sorus just dehisced. 



4. Ditto, in an advanced stage. 



5. Young sorus bent over on its upper face to shew the 

 origin or attachment of the inner indusium to the apex 

 of the vein. 



6. Transverse section of a sorus. 



7. Vein ; inner indusium and thecae in situ. 



8. Portion of outer indusium. 



9. Ditto, of inner. 



10. Thecae, annulus represented too complete. 



11. Sporules. 



12. Arachna. 



Plate. CXXIX. Fig. I. 



This Fern was given to me by Dr. Voigt, and was gathered 

 at Churrapunjee by Mrs. Voigt. It has much of the habit of 



