478 



A. HESSELBO 



is narrower than in Bryum inclinatnm, not-glossy, dark brown, finely 

 pitted (in B. inclinatnm smooth and glossy), with a high and conical lid. 

 The peristome teeth are narrow, dark yellow, with a very large, red 

 fundus which is very easily loosened from the mouth of the capsule 

 and falls off together with the peristome tooth belonging to it, equally 

 wide to the middle or gradually taperi::g from the base, and very 

 differently formed in the same peristome. Lamellae 1218 in number, 

 very differently developed even in the same peristome, straight or sinuous. 



frequently also porous in the median 

 line af the teeth. The spores vary 

 somewhat in size, from 0.020 mm. 

 (Borgarncs) to 0.02430 mm. (Vidi- 

 myri). 



140. Bryum islandicum n. sp. 



Gaespites densi ad 5 6 mm. alti. 

 Caulis ruber, fragilis, valde to- 

 mentosus , innovationibus brevibus. 

 numerosis. 



Folia caulina inferiora decur- 

 rentia, 1.5 mm. longa et 0.70.9 mm. 

 lata, superiora non vel vix decur- 

 rentia, ovata, longius cuspidata, api- 

 cem versus parce denticulata, 2 2.2 

 mm. longa et 0.75 mm. lata, ad 

 basin rubra; margine tota longitudine 

 reflcxa, seriebus 34 ccllularum 

 angustiorum . limbata. Cellulas lep- 

 todermes paulum porosse, basilares 

 rectangula2, 0.030.04 mm. longse et 

 0.02 mm. latae, ceterce elongato hexa- 



gonse. 0.030.04 mm. longre et 0.0150.018 mm. lata. Costa ad inscr- 

 tionem rubra, in aristam longam excurrens. 



Folia perichaetialia intima anguste lanceolata, vix limbata, costa 

 excurrente longiuscule cuspidata. 



Inflorescentia synoica; anthcridia et archegonia numerosa. 

 Seta ad 1520 mm. longa et 0.16 mm. crassa, rubra. 

 Capsula pendula, deoperculata ca. 3 mm. longa et 1 mm. crassa, 

 opaca fusca leptodermis, sicca leviter rugulosa. Operculum humile 

 conicum. Annulus latus. Cellule exothecii leptodermes, marginales in 

 series 34 transverse rectangulrc-polygonas quadratas, cetera? irregulares. 

 Exostomii dentes e fundo fusco-aurantio 0.4 mm. longi et 0.065 

 mm. lati, fusco-aurantii apice lutei, anguste limbati, subtiliter punctulati. 

 Lamelhe 1416, inter sc liberyc, marginibus integris. Endostomium 

 exostomio haud connatum, luteolum, parce papillulosum ; processibus 

 lanceolatis, in carina ovaliter fenestratis, ciliis pro more rudimentariis. 

 Sporse 0.0390.038 mm. diam. olivaceae, punctulatse. 

 N. Iceland: Akureyri, on damp ground at an altitude of about 300 

 metres, July 20th, 1909. 



Fig. 2. Bryum iftlandicum (X 2). 



