40G Transactions. — Botany. 



23. Verrucaria olivaceo-fusca, sp. n. 



Thallus olivaceo-fuscus la?vis tenuis continuus, apotbecioruin verrucis 

 minutis atro-fuseis convexis, ostiolo inconspicuo vix unquam pertuso. Apo- 

 tliecia in matrice subimmersa orbicularia, perithecio atro integro, hyrnenio 

 pallido-fusco, paraphysibus distinctis. Sporas hyalinas mox fuscae 4-celluhe, 

 cellulis liuibatis, longit. 0-019 mm., crassit. 0-008 mm. 



Ad cortices arborum. 



24. Odontrema concentricum, Stirton. 



Thallus cinereo-ochraceus tenuis continuus. Apothecia matrice hnpo- 

 Bita a thallo leviter irregulariterque obtecta, primo clausa, perithecio carbo- 

 naceo dimidiato ambitu recurvato mox dilaniato-dehiscente, hymenio tandem 

 concavo-discoideo ; epithecium j^rithecio divulso obsitum, paraphysibus sub- 

 tiliter capillaribus apice non dilatis linea fusca tenui enatis. Spora3 in ascis 

 cvlindraceis incolores normaliter cylindracre obtusaa nonnihil elongato-fusi- 

 formes, circiter IZ-septatce, cellulis quaternis v. lentiformibus, longit. 0'03 

 ad -05 mm., crassit. 0-006 ad -009 mm. 



Ad cortices arborum. 



EXPLANATION OF PLATES XXXIX— XLI. 

 Plate XXXIX. 

 No. 1. Piloplwron colensoi (Bab.), Knight. 



(a.) Section of apothecium x 38 diam. 



[b.) Gonidia x 300 diam. 



(c.) Granules (pseudo-gonidia) of which the medullary substance of the thalline 

 receptacle principally consists x 900 diam. 



(d.) Spores in ascus x 900 diam. 

 No. *1. Stereocaulon ramulosum. 



Ascus and spores x 900 diam. 

 No. 2. 3Iyriangium duricei, Mont, et Berk. 



(a.) Section of carbonized torus and apothecium x 38 diam. 



(6.) Section of portion of the above x 150 diam. 



(c.) Section x 900 diam. showing ascus and spores in situ. 

 No. 3. Physcia synthalea, sp. n. 



3 spores x 900 diam. 

 No. 4. Physcia adglutinata, Flk. 



Ascus and spores x 900 diam. 

 No. 5. Pannaria brunnea v. pulverulenta, Knight. 



(a.) Section of apothecium x 900 diam. 

 No. 6. Lecanora cyrtospora, sp. n. 



(a.) Section of apothecium x 38 diam. 



(b.) Ascus and spores x 900. 

 No. 7. Pertusaria cupularis, sp. n. 



(a.) Section of apothecium x 38 diam. 



