The Scottish Naturalist. 29 



sessilia, parva (latit. .3-. 5 mm.), primum plana rugosa, mar- 

 ginata et caesio-pruinosa, demum convexa, rugosa immar- 

 ginata et saepe connato-congesta ; sporae Snae ellipsoidese, 

 fuscae 3-septatae et fere murali-divisae, .013-.02 x .008- 

 •0095 mm. ; paraphyses non discretas, nonnihil irregulares 

 apicibus fuscis granuloso-inspersis ; hypothecium fiiscum 

 vel fuscescens. lodo gel. hym. intense caerulescens. 



Ad ligna ccesia. 



This lichen plays between L.fecunda and L.plicatilis (Leight). 



Opegrapha constriddla n. sp. — Thallus albidus vel pallidiis 

 • tenuis ; apothecia intus pallide fuscescentia, nigra simplicia 

 interdum aggregata, longit. .4-1.2 mm., latit. circ. .2 mm., 

 epithecio lato concavo vel etiam explanato, perithecio 

 lateral! ; sporae 8nae incolores obovatae, i-septatae, con- 

 strictae, .012-.017 x .0045-.0065 mm.; paraphyses confertae 

 irregulares, non bene distinctas apicibus fuscis (K sordide 

 caerulescentibus) ; hypothecium incolor. lodo gel. hym. 

 non tincta. 

 Ad corticem vetustum. 



In no instance have fuscous spores been detected, otherwise 

 this species might be referred to the group of which O. lenti- 

 ginosa is the type. 



Melaspika Patersoni n. sp. — Thallus albidus vel pallidus tenuis 

 vel evanescens; apothecia nigra plana vel convexiuscula 

 pai-va (latit. .15-.3 mm.); sporse 4nae (an semper?) incolores 

 aciculari-cylindraceae, pluriseptatae (circa lo-sep.), .04-. 06 

 X .0025-.003 mm., fragiles; paraphyses fiHformes, ramo- 

 sulas, apicibus intertextis obscuratis; hypothecium fusces- 

 cens vel pallidum. lodo hypothecium leviter vel obsolete 

 c^rulescens, caeteroquin hymenium non tinctum, proto- 

 plasma thecarum fulvescens. 

 Ad corticem emortuum. 



With one exception where there were five, only four spores 

 have been detected in each theca, and they lie in a direction 

 parallel to its length. The tendency to break up is very mani- 

 fest when the thecae are ruptured. The spores are then seen 

 in fragments varying in length, either simple or conUwero^ ^ 

 1-3 septa. X^^^^"^/ \ 



Decampia Hookerii Borr. f^^^^cP^ ^^y^J^ 



,^/^ ^•^ •^\C31 

 Glasgow, December, 1876. j llfeRAl^Y 



^•^\ -%^^ J ^ 



