Trigonanthe86 91 



longiusculi laxe bispiri. Sporce diametro elaterum tuber- 

 culosse. 



Species unica, Mijtylopsis albifrons S., habitat in montibus Andium 

 Peruvianorum orientalium Camjoana, Guayrapurina, &c. alt. 1000 metr. 

 supra mare, loci& cavis umbrosis, ubi ad folia emortua saxaqtie latos 

 csespites efformat. — Albescens, albido-viridis, rarius roseo picta, opaca 

 rigidiuscula fragilis. Caules fertiles (cum foliis 20 — 27-jugis) lineari- 

 lanceolati, steriles (cum foliis sub 40-jugis) lineares, rare apice attenu- 

 ati et radicantes ; rami nulli paucive et paucifolii, alii fiagellares radi- 

 celliferi. Folia subcontigua, vel ubi densiora equitantia, arte explicata 

 cordato-oblonga, toto margine eroso-repanda scaberulaque, apice sub- 

 acuto incisula ; lamellae lineari-rbomboide^e, anterior dimidio superiore 

 posteriorem ala ad carinam solum 1 — 3 cellulas lata superans ; cellulse 

 prseminutse subrotundae leviter 6-sinuatffi, trigonis magnis ad angulos 

 incrassatge, carinam versus oblongo-bexagonae, omnes convexulse et 

 minute verruculsose. Perianthia foliis 2 — 3plo longiora, obtusangula, 

 reti eodem ac bractearum laxo rectangulari rbomboideove subscarioso. 

 Capsala cellulae tesselatse, ad parietes laterales coltumnis trabeculisve 

 paucis fulcitae. Bractece cf paucijugse minutae concavee apice bidentes. 

 — Caules 5 — 15 ^'^ longi, cum foliis 1-2 ™™ lati ; folii lamince '65 x "3 ; c 

 1/8°; hr. -75 X -5, 5,. la .9 x -5; ^j^r 2-0 x -6; 1-35 x '5, -8— 1-0 ; caps 

 •8 X -5 ; elaf25 ^'". 



Genera liuic affinia, sc. Lepidozia, Micropterygiiim, Bazzania, omnia 

 foliolis sat magnis et conspicuis ad caulem et ramos gaudent. In 

 duobus prioribus ramificatio normalis pinnata est, in tertio dichotoma ; 

 si casu rariore adveniat ramus posticus, ad caulis primarii instar ramu- 

 losus est. — In Mytilopsi autem omnes rami (Cephalozice quem ad modum) 

 ]DOstici sunt, et foliola nuUibi (nisi ad flores) obvia. Eamus Q interdum 

 elongatus, infra involucrum tamen apbyllus. Folia caulina ad carinam 

 valde fissilia, raro apice revera subbifida ; flagellorum minuta cocbleata 

 bifidula. 



Obs. The branches spring from the middle of the underside of the stem. The 

 leftves veil the stem at both front and back, and their bases imbricate those of the 

 opposite side of the stem ; so that the branches also are veiled at their insertion by 

 the leaf-bases on both sides, but are never axillary to them, as the pinnate branches 

 of Micropterygiiim are. 



