American Midland Naturalist Monograph No. 6 



Andreaed Rot bit 

 Astomum Muhlenbergianum 

 Atrichum crispum 

 Brachythecium oxycladon 

 Bruchia Sullivantii 

 Discelium nudum 

 Drepanocladus aduncus 

 Entodon compiessus 

 Ephemerum serratum 

 Grimmia pilifera 

 Hookeria acutijolia 

 Mnium spinulosum 

 OrthotTtchum obtusifolium 

 Plagiothecium Roeseanum 



Astomum Muhlenbergianum 

 Ptychomitrium incitrvum 

 Rhacomitrlum heterostichum 



var. gracilescens 

 Raphidostegium marylandicum 

 Rhytidium rugosum 

 Sphagnum fuscum 

 Sphagnum Girgensohnii 

 Sphagnum papillosum 

 Sphagnum Wulfiamim 

 Splachnum ampullaceum 

 Tetraplodcn angustatus 

 Thuidium pygmaeum 



For some of the mosses included in the first edition no satisfactory material 

 from western Pennsylvania was then available for illustration. Specimens of 

 twenty of these species have since been collected in our region and have now 

 been illustrated in the present edition, as follows: 



Bryhnia noyae-angliae 

 Dicranella rufescens 

 Dicranum rugosum 

 Drepanocladus fiuitans 

 Encalypta streptocarpa 

 Entodon compressus 

 Fissidens hyalinus 

 Fontinalis gigantea 

 Hygroamblystegium orthocladon 

 Isopterygium deplanatum 



Isopterygium elegans 

 Isopterygium geophilum 

 Mnium hornum 

 Octodiceras debile 

 Plagiothecium Roeseanum 

 Pleuridium subulatum 

 Sphagnum squarrosum 

 Stereodon pratensis 

 Tortula papillosa 

 Trematodon ambiguus 



Including the above additions the present edition contains 18 additional 

 plates covering forty-six species and bringing the number of individual figures 

 to a total of three thousand five hundred and seventeen. 



In addition to the 243 kinds of mosses described and illustrated by original 

 drawings by the author from collections made in western Pennsylvania there 

 are included more than 100 descriptions of sf)ecies reported for the region by 

 various collectors years ago or which are known to occur in territory adjacent 

 to western Pennsylvania. Some of the species reported for our region by T. P. 

 James, Thos. C. Porter, and others are p>erhaps not now to be found here, while 

 others known from adjoining regions will undoubtedly eventually be found 

 here, although, unlike some of these localities, we do not have extended areas 

 of limestone outcrops such as occur to the east and west, on which certain 

 calciphilous species commonly occur. 



The following new combinations occur in the second edition. 



Sphagnum palustre var. squarrosulum (Nees &: Homschuch ) 

 Sphagnum palustre var. brachycladum (Schliephacke) 

 Sphagnum plumulosum i. viride (Wamstorf) 

 Atrichum undulatum var. allegheniense (Jennings) 

 Eurynchium pulchellum var. praecox (Hedwig) 

 Pohlia nutans var. triciliata 



