A. W. Evans — Haioaiian Hepaticm of the Tribe Juhuloidece. 415 



whole branch or terminal, bracts in many pairs (sometimes twelve 

 or more), imbricated, concave, smaller than ordinary leaves, sub- 

 equally bifid with entire divisions rounded at the apex; bracteoles 

 smaller than the other underleaves but otherwise similar to them. 



Stems 0.14™" in diameter, lobes of leaves 1x9.7™"', lobules when 

 explanate 0.3x0.2"™, underleaves 0.5x0.65"", leaf-cells at edge of 

 lobe 16)U, in diameter, in the middle 25/x, and at the base 32x25/a, 

 lobe of bract 1.4 x 0.75"", lobule 0.5 x 0.08"", bracteole 0.95x0.8"", 

 perianth 1.55x0.9"". 



On trees and banks. Oahu: Luakaha, Nuuanu, foot of Kona- 

 huanui (Cooke); also collected by Andersson, by Didrichsen, and by 

 Mann and Brigham. Kauai: Kilohana (Cooke). Hawaiian Islands 

 (Hillebrand). 



Although in this species there are usually no branches in the 

 vicinity of the involucre, specimens will occasionally offer an excep- 

 tion to this rule. In such cases branches may arise A'ery close to the 

 perianth, in very rare instances in fact appearing as true innovations. 

 Such specimens, however, are so entirely like typical plants in other 

 respects, that it would be artificial to separate them, much more so 

 to place them in distinct genera. The crests on the perianth of 

 L. sxbnuda are very variable: sometimes they are narrow and very 

 slightly sinuate or sinuate-dentate on the margins; sometimes they 

 are broader and sharply laciniate-dentate : it is, however, possible to 

 find many intermediate conditions. 



A close ally of the Hawaiian species is the widely distributed 

 Lopholejeunea Sagraeana (Mont.) Scliiffo., which is likewise autoi- 

 cous. This species is, however, smaller, its leaves increase rapidly 

 in size toward the perianth, and this latter organ is almost immersed 

 in the involucre and very strongly laciniate on the keels. L. eidopha 

 (Tayl.) Schiffn., found in various Pacific islands, has spinose bracts 

 and bracteoles and is dioicous. 



On the strength of specimens collected by Mr. Heller, Herr 

 Stephani has listed as a Hawaiian plant a species found on the Mari- 

 anne Islands, namely, Archilejetmea Mariana (Gottsche) Steph.* 

 Through the kindness of Professor Underwood, who is now in pos- 

 session of Mr. Heller's hepatics, I have been enabled to examine a 

 large number of specimens so named, but find among them no 

 Ziejeunea with undivided underleaves excepting Lopholejeunea sub- 

 nuda. It is of course possible that the Archilejeunea occurred in 



* Bull, de I'Herb. Boissier, v, 842. 1897. 



