50 A MAXUAL OF MOSSES 



j. Capsule with 8 furrows and 8 ridges: leaf-cells not mamniillate. 



8. Rhabdoweisia. 



j. Capsule not furrowed nor ridged; leaf-cells strongly mam- 

 mil late. 10. Oreowcisia 

 k. The 16 peristome-teeth cleft only to about the middle. 



k. The 16 peristome-teeth cleft to the base; alar cells reaching to the 

 costa. 13. Dicranodontium 



1. Peristome-teeth united at base to form a tube, deeply in- 

 serted; capsule strumose. 9. Oncof>/ionts. 

 1. Peristome-teeth not forming a tube, only slightly inserted; 

 capsule rarely strumose. 10. Dicranum. 



1. BRUCHIA Schwaegrichen. 



Autoicous or paroicous ; gregarious : green protonema per- 

 sistent but sparse ; stem short with a central strand ; leaves 

 long-canaliculate-subulate, from an oval to lanceolate base, 

 erect to secund ; costa broad and flat, rilling the subulate 

 acumen; laminal ceils rectangular; seta short; capsule pyri- 

 form, immersed or slightly exserted, with a more or less long 

 neck, more or less cernuous, rostrate ; operculum none ; 

 calyptra covering one-third or more of the capsule, mitrate. 

 unsym metrically cleft. 



A widely distributed genus of about 25 species, 14 of 

 these being found in North America, two of the latter prob- 

 ably occurring in our region. 



Key to tJie Species. 

 a. Capsule ovoid-pyriform. collum very short. 



T. B. flr.ruosa. 

 a. Capsule ovoid-oblong, collum a little longer. 



2. B. sullivantii. 

 1. Bruchia flexuosa (Schwaegrichen) Mueller. 



Gregarious, the green protenema persistent but not very 

 conspicuous : stems about 2-4 mm. long, curved to erect ; 

 leaves remote, small, lance-subulate, erect-spreading from a 

 concave base, somewhat serrulate at the apex ; leaf-cells long- 

 rectangular, sub-papillose, alar not much different ; antheridia 

 in axils of comal leaves or in separate buds; seta short, stout, 

 usually shorter than the erect, ovoid-pyriform, partially ex- 

 serted, apiculate capsule ; calyptra narrowly conic, mitrate ; 

 spores decidedly papillose, mature in May or June. 



On clay soil in fields from Minnesota to Xe\v England and 

 south to the Gulf States. Occurs in eastern Pennsylvania and 

 in Ohio and is to be expected in our range. 



2. Bruchia sullivantii Austin. 



Very close to B. fle.vnosa, from which it differs mainly in 

 having shorter stems; the leaves narrowly lance-ovate, smooth 

 or nearly so; the leaf-cells shorter rectangular; the capsules 

 with a short and rather inconspicuous collum and altogether 

 more nearly ovoid-oblong than pyriform. 



