70 SOCIÉTÉ BOTANIQUE DE FRANCE. 
Obs. — Affines huic I. muricata DR., e Nova-Anglia indigena, cujus folia lon- 
giora, sporangium velo semi-adopertum, spinulæ macrosporæ breviores; et 
I. Boottii Al. Br. bostoniensis, cujus macrospore paulo minores, spinulis 
tenuissimis. 
6. I. Braunii DR. (I. ambigua Al. Br.). — Foliis intense viridibus ; sporangiis 
maculatis, velo latiore, microsporis levibus. — America septentrionali, Groen- 
landia, Islandia. 
7. I. azorica DR. Milde Fil. Eur. 278. — Foliis 2-3-pollicaribus; sporangiis 
non maculatis, velo lato, macrosporis mediocribus, reticulatis, microsporis gra- 
nulosis. — Insulis Azoris (H.-C. Watson n. 349). 
8. I. pygmæa Engelm. Amer. Nat. [1874] 214.— Foliis 7-1-pollicaribus; velo 
angustissimo ; macrosporis mediocribus, papillis parvis regularibus, raro con- 
fluentibus instructis, microsporis fere laevibus. — California (Bolander). 
C. Velum completum. 
9. I. Stuartii M. Br. Berl. Monatsb. [1868] 539 (I. humilior F. Müll.). — 
Foliis 4-6-pollicaribus; macrosporis maxime tuberculosis, — Tasmania 
(G. Stuart). 
Obs. — I. Hookeri Al. Br. videtur forma ejusdem speciei, macrosporarum 
tuberculis distinctis minoribus. 
10. I. Lechleri Mett. Fil, Lechl. 1,96.— Foliis 3-4-pollicaribus ; macrosporis 
levibus. — Peruvia (Lechler n. 1937). 
Sect. 2. — SUBAQUATICÆ. 
Species Americæ septentrionalis, rhizomate bilobo. 
A. Velum partiale. 
11. I. Bolanderi Engelm. Amer. Nat. [1874], 676 (I. californica Engelm. msc. 
olim). — Foliis 2-4- ;-pollicaribus; sporangiis non maculatis, macrosporangiis 
parvis, tenuiter granulosis. — California, Sierra-Nevada (Bolander). 
12. I. Tuckermani Al. Br. Engelm. in Gray Man, edit, 5, 676. — Foliis 
3-4-pollicaribus ; sporangiis aliquando maculatis, macrosporangiis mediocrihus, 
reticulatis. — Prope Boston cum I. echinospora intricata. 
13. I. saccharata Engelm. in Gray Man. edit. 5, 676. — Foliis 2-3-pollica- 
ribus; sporangiis fere immaculatis, macrosporis mediocribus, minute tubercu- 
losis. — Maryland (Canby). 
14. I. riparia Engelm. ibid. — Foliis 4-8-pollicaribus; sporangiis maculatis, 
macrosporis mediocribus, ubique grosse granulosis ; microsporis latis, tubercu- 
losis. — Delaware, New England. 
B. Velum completum. 
15. I. melanospora Engelm. Oaks of the United States, p. 11 in nota. — 
Georgia (Canby). 
