110 A SYNOPSIS OF THE SPECIES OF ISOETES. 



43. I. cubana, Engelm. MSS. — Rootstock 3-lobed. Leaves 

 10-50, |— 1 foot long, | lin. diain. at the middle, opaque, moderately 

 firm in texture, furnished with stomata and accessory bast-bundles, 

 the membranous base suddenly dilated. Sporange small, oblong, 

 unspotted ; veil very narrow. Macrospores small, strongly 

 tubercled. Microspores papillose. 



Hab. Cuba, C. Wright, 3912 ! 



44. I. Gabdneeiana, Kunze herb ; A. Br. in Verhand. Brand. 

 1862, 34. — Rootstock 3-lobed. Habit of coromandelina. Leaves 

 50 or more, about a foot long, 1 lin. diam. at the middle, slightly 

 diaphanous, tapering to the point, furnished with copious stomata 

 and accessory bast-bundles, with a narrow membranous border 

 running up 2-3 in. from the dilated base. Sporange large, 

 oblong ; veil none. Macrospores large, brown, beset with numerous 

 round tubercles. Microspores smooth. 



Hab. Marshes, Mission of Duro, Province of Goyaz, Brazil, 

 Gardner, 3563! Our specimens are without macrospores. A 

 Paraguay plant, gathered by Balansa (1126) has them chalk-white 

 and closely strongly tubercled. 



Group 4. Terrestres. — Species growing in damp soil. 

 Leaves furnished with accessory bast-bundles and abundant 

 stomata. Bases of the leaves of a former year regularly 

 persistent on the rootstock round the head rosette in the form 

 of rigid dark-coloured scales. 



45. I. Durusi, Bory, Comp. Rend. Acad., June, 1844 ; A. Br. 

 Expl. Sc. Alg., t. 36, fig. 2.—/. tridentata, Durieu.— Rootstock 

 deeply 3-lobed. Leaves 10-40, very slender, 2-4 in.' long, } lin. 

 diam., pale green, firm in texture, with abiuidsuit stomata and 

 accessory bast -bundles ; bases of the old leaves always short and 

 minutely toothed. Macrospores middle-sized, conspicuously 

 honeycombed. Microspores finely granulated. 



Hab. Mediterranean region from Portugal to Asia Minor. 



IP'S 

 Bor 



46. I. Hystrix, Fory/Comptes Rend. Acad., June, 1844 ; A. Br., 



Expl. be. Alg., t. 36, fig. 1.—/. Belalandci, Lloyd.—/, sicula, 



lodaro.— I. Dunmi, Hook. Brit. Ferns, t. 56, non Bory.— 

 tephahceraton Hystrix, Gennari.— Rootstock and leaves exactly as 

 in 1. Dunm, but the old leaf bases in the type furnished with hard 



Sr i*T* m * l0ng " Macros P° res finel y granulosa Microspores 



Hab. Guernsey and N.E. France to Spain and Asia Minor. 

 Var suhnermi,, Durieu (J. Hytrin, forma desquamata, A. Br.; 

 ^epkaloceratun^mnocarpuni, Gennari), differs by having only short 



points to the leaf-bases, like those oil. Duruci. 



