108 THE JOUKNAL OF BOTA^'T 



hymenium without algal cells ; asei clavate ; paiuphyses hyaline, 

 disappearing or absent; osteolar filaments few or none; hymenial 

 gelatine bright-red with iodine ; spores 8-na?, colourless or greyish, 

 ellipsoidal, granular, f)ne end usually narrower than the other, 

 1-septate, lightly constricted in the middle, 16-28x7-11 a (fig. B). 

 On soil of hedge-bank, Cheddon Fitzpaine, South Somerset (5), 

 associated with Torfulo cuneifoJia, Barhula falJax, protonema and 

 Dacfj/Iococciis dispnr, March 1915. It is near T. Zwackii l^e\)\^, 

 but that occurs on rock and the spores are 1-3 septate. There is 

 no sign of any further septation in T, terrestre, 



Polyblastia mortensis, sp. nov. Thallus tenuis, crustaceus, 

 minute granulosus, effusus, continuus, vel cinerascens vel cinereo- 

 virescens vel fuseescens vel olivaceus interdum nigrescens vel sub- 

 evanescens, in statu humecto baud gelatineus, gonidiis viridibus. 

 Perithecia parva vel mediocria, semi-immersa, parte tertia superiore 

 emersa, convexa, nitentia ; tunica superne crassa et nigra, ad basin 

 tenuis et brunnea ; ostiolo leviter depresso ; hymenio sine gonidiis ; 

 osteoleis filamentis aut paucis aut nullis ; ascis subinfiate clavatis ; 

 paraphysibus mucilagineis aut paucis aut nullis ; gelatina hymenia 

 vinosa cum iodo ; sporis oblongis, octonis, hyalinis demum cinereo- 

 brunneis, muraliformibus cum 7-14 transversalibus ordinibus cellarum 

 parv^arum, 0"010-50 mm. longis, 0*016-20 mm. latis. 



In CfBmento aut in solo summorum murorum, prcjpe mare. 



Thallus thin, crustaceous, minutely granulose, effuse, continuous, 

 greyish or greenish-grey or olivaceous, sometimes darker or evanescent, 

 not gelatinous when moist, algal cells green (Protococcus). Perithecia 

 small or moderate, semi-immersed with the upper third emergent, 

 convex, shining ; wall black, at the base thin and brown ; osteole 

 slightly depressed ; hymenium without algal cells ; osteolar filaments 

 few or none ; asci clavate somewhat inflated ; para})hyses few or none, 

 mucilaginous ; hymenial gelatine wine-red with iodine ; spores oblong 

 S-nse, colourless, becoming brownish, muralilocular with 7-14 trans- 

 verse rows of small cells, 40-50 x 16-20 /a (fig. A). 



On soil-cap of walls or on mortar, often on decaying mosses such as 

 Tortilla muralis, near the sea, Morte, N. Devon (4), December, 1918. 



This species is near P. terrefitris, which has smaller spores. 

 P. yelafinosa besides other chamcters has osteolar filaments, which are 

 absent or almost so in this plant. Verruca ria interfucjiens Nyl. lias 

 thinner spores. 



8pilon&ma faradoonnn Born. On damp siliceous rocks near 

 Tremadoc (48) and Beddgelert (49). August 1915. 



Schizoma Uchinodeum^yX. On ground with MifureUa apiculata^ 

 Ben Eachan, 3200 ft. (88). 'August 1913. 



Collema ceraniscum Nyl. On damp shaded rocks near Blindia 

 ccBspiticia, 3900 ft., Ben Lawers (88). The locality is given in 

 Crombie's Monograph, but it is worth while recording it as still 

 occurring there in 1913. 



C. pulposum (Bernh.) Ach. A form with a well developed 

 thallus forming a i-osette occurs at Loxton (6), Quantoxhcad (5), etc. 



