524 Transactions.— Botany. 
Verrucaria minutissima, Knight. 
Thallus atro-cinerascens tenuissimus. Apothecia contigua minutissima 
prominula dimidiatim nigra, poro pertuso instructa, paraphysibus distinctis. 
Spore dilute fusce, uniseptate (an interdum 3-septate ?) in medio sub- 
constrict, cellula superiore majore, longit. ‘018 mm., crassit. 005 mm. 
Ad cortices arborum. 
Thallus dark grey, very thin. Apothecia contiguous, very minute, 
somewhat prominent, dimidiate, black, with an open pore, paraphyses 
distinct. Spores light brown, 1-septate, (sometimes 8-septate ?) constricted 
in the middle, the upper cell larger, length ‘018 mm., breadth -005 mm. 
On bark of trees. 
‘The spores have much the appearance of a spheria. Except the bright 
colour, not unlike those of Verrucaria conferta, Tayl. (Leight. Angios. Lich.) 
Fig. 20. Section of apothecium magnified 14 diameters. 
20. a, Spores 300 
” ” 
Verrucaria dealbata, Knight. 
Thallus albescens tenuis effusus glaber. Apothecia nigra hemispherico-— 
conoidea parva dimidiata, paraphysibus distinctis. Spore in ascis cylin- 
draceis dilute fuscw ellipsoidex 8-5-septatae, longit. 023 mm., crassit. 
‘008 mm. 
Ad cortices arborum. 
Thallus whitish, thin, effuse, smooth. Apothecia black, haemispherico- 
conoid, small, dimidiate ; paraphysis distinct. Spores in cylindrical ascus, 
faint brown, ellipsoid, 3—5-septate, length -023 mm., breadth -008 mm. 
On bark of trees. 
Fig. 21. Section of apothecium magnified 14 diameters. 
21. a, Spores 
”? 9 
Verrucaria saxicola, Knight. 
Thallus luteo-olivaceus tenuissimus y. nullus. Apothecia parvula 
haemispherica, perithecio carbonaceo integro, ostiolo inconspicuo, nucleo 
subgloboso hyalino, paraphysibus capillaribus farcto. Sporae in ascis 
elongato-cylindraceis incolores fusiformes, 7-8-septatae, longit. -032 mm., 
crassit. (005 mm. 
Ad saxa. 
Thallus yellowish-olive, very thin or none, Apothecia rather small, 
