Cahjiitothecium] mosses (Gepp). 293 



Sterile. Secondary stems 5 to 10 cm. long, densely or laxly 

 pinnate or divided into two or three pinnate branches, yellowish 

 green at apex, scarcely shining, dull and lutescent with age and 

 soon decaying; pinnae 0"5 to 1"2 cm. long, obtuse at apex, 

 occasionally longer and attenuate at apex; leaves 2-2 to 2*4 mm. 

 long, 0'9 mm. wide near base, complanate, rugulose when dry, from 

 a wider auiiculato-cordate base ovate then ligulate (0"45 mm. 

 wide), acute, shortly acuminate, either symmetrical and slightly 

 hollowed, or concave on one side ; margins flexuose especially 

 near base, entire or obsoletely serrulate below, serrulate near 

 apex; nerve slender reaching or surpassing the middle of the 

 leaf ; cells pellucid linear vermicular, becoming elliptic and 

 rhomboid obscure in the auricles and lax quadrate, brown with 

 age, at the basal angles ; cell-walls firm yellow indistinctly porose. 



This species is probably closely allied to Xeckera acutifolia Brid., 

 as described by Bescherelle in Ann. Sci. Nat. ser. 6, t. x. p. 273 

 (1880), and still more to (kihjptothecium, sidxiCKtifolmm Broth, in 

 Engl. Bot. Jahrb. xxiv. ii. p. 254 (1897); but appears to differ 

 from the latter in the lighter colour of the plant and in the less 

 hollow more auriculate leaves, and from the former in the smaller 

 size of the plant and the dull surface and different shape of the 

 leaves. The firm yellow cell-walls distinguish our plants from 

 such allies as Neckera Moritzii C. Muell. and Pterobryimi 

 duplicatum Mitt., in which the cell-walls of the leaves are thicker, 

 cartilaginous and distinctly porose. 



GoLUXGO Alto. — On old trunks and rocks in the vicinity alongside 

 brooks in the primitive forests of Zengas do Alto Queta and Mata de 

 Quisucula ; without fr. Feb. and July 1856. No. 147. 



28. POROTRICHUM Doz. et Molk. Bry. Jav. ii. p. 69 (1862). 



1. P. lopidioides C. Muell. in Dusen, Musci Africani Camerun. 

 exsicc. No. 469 (1893). Paris, Index Bryolog. iv. p. 1015 (1898). 



Uypnmn (Tham7iium) africanimi Welw. et Dub. in Geneve, 

 Mem. Soc. Phys. XXI. ii. p. 436. t. iii. fig. 4 (1872). Thamnimn 

 africanum Jaeg. Gen. et Spec. Muse. II. p. 216 (1877). Thuidium ? 

 jiliforme Welw. et Dub. in Geneve, Mem. Soc. Phys. XXI. ii. 

 p. 436. t. iii. fig. 4 {Thuidium filiferum), (1872). 



GoLUXGO Alto, — In a dense mass on rocks and tree-trunks by the 

 Quarengue stream on the Queta mountains ; without fr. April 1856. 

 No. 148. A widely CEespito-^e pendulous, dendrophilous moss, on 

 trunks of trees (" Dizanha," TrecuUa africana) in the shadiest parts 

 of the mountains of eastern Queta ; without fr. middle of June 1857. 

 No. 148i. In company with Cryphcea and other mo-<ses on trunks 

 and thicker branches of trees on the summit of Cungulungulo ; 

 without fr. Feb. 1855. No. 168. Mixed with tufts of Racopilum 

 tomentosum (No. 166) on bark in the woods of Alto Queta alongside 

 the Catombe brook; without fr. and in small quantity end of June, 

 July 1857. No. 169. Also Alga No. 138. 



St. Thomas's Island. — Growing with P. Quhifani on bark at the 

 foot of trunks in dense woods at an elevation (jf 2500 ft., at Novo 

 Destine ; without fr. Dec. 1860. No. 124. 



Our plants are sterile and mostly small and imperfect. 



VOL. II. 20 



