416 A.W. Evans — Hawaiian Hf.patica; of the Tribe Juhuloidem. 



small amount in the specimens forwarded to Herr Stepbani for deter- 

 mination, but was wanting in the rest of the collection. On account 

 of the uncertainty concerning it^ however, the species is omitted from 

 the present account. 



4. PLATYLEJEUNEA (Spruce) Schiflfn. 



Leujeiinea subgenus Platy-Lejeiinea Spruce, Hep. Amaz. et And. 



124. 1884. i 

 Platylejexmeu Schiffn. ; Engler & Prantl, Nat. Pflanzenfam. i\ 130. 



1893. 



Plants large to very large, brown or blackish-brown, creeping 

 or pendulous : stems irregularly pinnate : leaves somewhat imbri- 

 cated, the lobe horizontally spreading, ovate, usually more or less 

 incurved at apex and recurved along postical margin, entire, usually 

 rounded or obtuse at apex ; lobule small, strongly inflated and cucul- 

 late near axis : underleaves large, more or less imbricated, orbicular 

 to reniform, broadly truncate or retuse, entire, often decurrent : 

 leaf -cells with large and distinct trigones: 2 inflorescence borne on 

 a very short branch, with a single, short, sterile innovation on one 

 side; bracts much smaller than the leaves, subequally bifid, entire; 

 bracteole narrow, obtuse or more or less indented at apex; perianth 

 small, oblong or obovate, rounded to emarginate at apex, strongly 

 compressed, margins more or less incised-fimbriate, surface smooth 

 or with a few scattered papillae, antical surface plane, postical sur- 

 face with two to four low, usually spinose keels : 3 terminal on a 

 principal branch or on a short special branch, bracts in many pairs. 



Two species of Pkitylejeunea have been accredited to the Hawaiian 

 Islands. The first of these, P. haccifera, as Herr Stephani has 

 already pointed out,* was at first incorrectly referred to Lejeunea 

 transver salts ^ a plant of tropical America. I have examined the 

 Hawaiian material labeled Jangermannia transversal is, var., in the 

 herbarium at Kew and find that it agrees closely with the Australian 

 type-specimen of Phragmicoma haccifera in the same collection. Of 

 the second species, P. cryptocarpa, the type-specimens have been 

 kindly sent me by Mr. Mitten. Apparently neither of these species 

 has been collected on the Islands since 1793. 



* Hedwigia, xxix, 13. 1890. 



