82 BEPATICJ^.. 



8. Sub-bract x 16 (Portugal, hb. S.O.L.). 9. Sub-bracteole x 16 

 (ditto). 10. Bract x 11 (ditto). 11. Bract and bracteole x 11 

 (ditto). 12. Perianth x 11 (ditto). 13. Portion of mouth of 

 perianth x 85 (ditto). 



2. Porella Thuja {Diclcs.), Moore. 



Lichemi,struin arhoris vitce facie, foliis rotundioribus, Dill. Hist. muse. p. 502, 



t. 72, f. 33 (1741). 

 Jungermania Thuja, Dicks. PI. Crypt. Brit. Fasc. 4, p. 19(1801); Tayl. in 



Trans. Bot. Soc. Edin. xi. p. 116 (1841). 

 Madotheca Thuja, Dum. Comm. p. Ill (1822), 

 Porella Thuja (Dicks.), Moore in Proc. R. I. A. 2nd ser. vol. ii. p. G18 (187G). 



Dioicous, imbricately csespitose, largish to large, brown or 

 olive-brown, apices of branches often pale yellow. Stem 

 irregularly bipinnate, frontally compressed, cross-section showing 

 about 100 cortical cells very small with thick dark walls, 25 x 30 

 cells in diameter, inner cells large and hyaline ; more or less 

 robust, firm; radiculose, rootlets fasciculate, coarse, reddish- 

 brown, produced from the base of the stipules. Leaves incubous, 

 appressed, involute when dr\'", closely imbricate, horizontal, 

 unequally bilobed, antical lobe much larger, convex, obliquely 

 rotund-ovate, apex decurved, rotundate-obtuse, margin entire, or 

 rarely with few distant teeth ; postical lobe or lobule hardly 

 decurrent, very slightly attached at its base to the antical lobe, 

 patent, ovate to ovate-oblong, a,pex obtuse or acute, sometimes 

 uncinate, margin recurved, entire or rarely with few small teeth 

 near the base ; a little longer and narrower than the stipules ; 

 texture subopaque, firm but pellucid, epidermis slightly polished, 

 verruculose, cells smallish 4-, 5- and 6-angled, roundish-quadrate, 

 walls thick, trigones distinct. Stipules imbricate, appressed to the 

 stem, decurrent, sub-reniform, sub-cordate or oval, broader than 

 long on stem, longer than broad on branches, margin reflexed, 

 entire or rarely with few teeth near the base. Female flowers on 

 short lateral branchlets, only imperfect ones seen. Bracts larger 

 than the leaves, antical lobe oblong-ovate or obliquely rotund- 

 ovate, apex subacute, margin irregularly dentate, postical lobe 



