47<S 



A. HESSELBO 



is narrower than in Brijnm incUiudnm, not-glossy, dark brown, finely 

 pitted (in B. incUiudnin snioolli and glossy), witli a liigh and conical lid. 

 Tlie peristome teeth are narrow, dark yellow, witli a very large, red 

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

 and falls off togelher with the ]ieristome toolh belonging to it, equalh" 

 wide to the niiddle or gradually taperiig Ironi the base, and very 

 differently fornied in the same jieristome. Lamellæ 12 — 18 in numbcr, 

 very difTercntly develoj^ed evcn in the same peristome, straight or sinuous. 



frecjuently also porous in the median 

 line af the teeth. The spores vary 

 somewhat in size, from 0.020 mm. 

 (Borgarnes) lo 0.024-30 mm. (Yidi- 

 myri). 



140. Bryum islandicum n. sp. 



C æ s p i t e s densi ad 5 — 6 mm. alti. 

 Caulis riiber, fragilis, valde to- 

 mentosus , innovationibus brevibus, 

 niinierosis. 



Folia caulina inferiora decur- 

 rentia, 1.5 mm. longa et 0.7 — 0.9 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 

 reflexa , seriebus 3 — 4 ccllularum 

 angustiorum limbata. Cellulæ lep- 

 todermes paulum porosæ, basilares 

 rectangulæ, 0.03—0.04 mm. longæ et 

 0.02 mm. latæ, ceteræ elongato hexa- 

 0.03—0.04 mm. longæ et 0.015—0.018 mm. lata. Costa ad inscr- 

 tionem rubra, in aristam longam excurrens. 



Folia peric hætialia intima anguste lanceolata, vix limbata, costa 

 excurrente longiuscule cuspidata. 



Infloresce ntia synoica; antheridia et archegonia numerosa. 

 S eta ad 15—20 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. Cellulæ exothecii leptodermes, marginales in 

 series 3—4 transverse rectangulæ-polygonæ quadratæ, ceteræ irregulares. 

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

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

 Lamellæ 14—16, ihter se liberæ, marginibus integris. Endostomium 

 exostomio haud connatum, luteolum, parce papillulosum ; processibus 

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

 Sporæ 0.039—0.038 mm. diam. olivaceæ, punctulatæ. 

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

 metres, Julv 20th, 1909. 



Fig. 



JSri/iim inlandicuin (X 2). 



gonæ. 



