1960] 



BOTANY OF THE GUAYANA HIGHLAND PART IV 



7 



Brachymenium (Peromnium) sipapoense Bartr., sp. nov. 



Caespitosum, eaespitibus densis, rufeseentibus, opaeis. Caulis usque ad 3 cm 

 altus, parce ramosus, iuferne dense rufotomentosus. Folia sicca erecta, leniter 

 flexuosa, humida erecto-patentia, oblongo-laneeolata, acuminata, 3-3.5 mm longa, 

 0.6 mm lata; marginibus planis, inferne integris, prope apicem spinoso-serratis ; 

 costa exeurrenti ; cellulis superioribus linearibus, 75 /x longis, 12 /x latis, margines 

 versus angustioribus, 4— 5-seriatis limbum indistinctum formantibus, basilaribus 

 brevioribus. Seta 2 cm longa rubra ; thet-a erecta, oblongo-cylindrica, deopercu- 

 lata 5 mm longa. Caetera ignota. 



VENEZUELA: Cerro Sipapo (Paraque), eafio from West Peak drainage, alt. 1230 m, 

 Maguire 4' Politi 27811, 20 Dec 1949 (type). 



Possibly near B. radicuJosum ( Schwaegr.) Par., but with more elongate 

 upper leaf cells and spinose-serrate margins near the apex. The capsules are too 

 old to show the peristome characters. 



RHACOPILACEAE 



Rhacopilum tomentosum (Hedw.) Brid. 



VENEZUELA: Bolivar: Chimanta Massif, between Bluff Camp and low promontory 

 north of Bluff Camp, along west-facing portion of Chimanta-tepui (Torono-tepui), alt. 1600- 

 1700 m, Steyermarlc 75640. 



HEDWIGIACEAE 



Rhacocarpus humboldtii (Hook.) Lindb. 



VENEZUELA: Bolivar: Chimanta Massif, along Rio Tirica between Middle Falls and 

 Summit Camp, alt. 1856 m, Steyermarlc 4- WurdacJc 252, 263, 265 ; vicinity of Upper Falls of 

 Rio Tirica above Summit Camp, alt. 1940-1950 m, Steyermarlc $ Wurdaclc 623. 



PTEROBRYACEAF 



Orthostichopsis tetragona (Hedw.) Broth. 



VENEZUELA: Bolivar: Chimanta Massif, rich rain forest on lower northwestern slopes 

 of Abacapa-tepui, vicinity of Camp 1 along Rio AbAcapa, alt. 420 in, Steyermarlc 74737. 



METEORIAC'EAE 



Squamidium leucotrichum (Tayl.) Broth. 



VENEZUELA: Bolivar: Chimanta Massif, scrub forest near Summit Camp, alt. 1925 m, 

 Steyermarlc 4' Wurdaclc 294; rich forested steep west-facing slopes below Camp 3, north- 

 western part of Abacapa-tepui, alt. 1110-1200 m, Steyermarlc 75129. 



Pilotrichella flexilis (Hedw.) Jaeg. 



VENEZUELA: Bolivar: Chimanta Massif, swampy savanna in depression along tributary 

 valley of east branch of headwaters of Rio Tirica, alt. 2120 m, Steyermarlc 4r Wurdaclc 844. 



NECKERACEAE 



Porotrichum longirostre (Hook.) Mitt. 



VENEZUELA: Bolivar: Chimanta Massif, moist mossy forest, vicinity of Camp 4, south- 

 western edge of Apacara-tepui, alt. 1600-1800 m, Steyermarlc 75022. 



PILOTRICTI ACEAE 



Pilotrichum bipinnatum (Schwaegr.) Brid. 



VENEZUELA: Bolivar: Chimanta Massif, southwestern-facing forested slopes of Chi- 

 manta-tepui (Torono-tepui) between base camp and steep slopes above valley of Rio Tirica, 

 alt. 1000-1400 m, Steyermarlc 75370. 



