406 Transactions.— Botany. 
23. Verrucaria olivaceo-fusca, sp. n 
Thallus olivaceo-fuscus levis tenuis continuus, apotheciorum verrucis 
minutis atro-fuscis convexis, ostiolo inconspicuo vix unquam pertuso. Apo- 
thecia in matrice subimmersa orbicularia, perithecio atro integro, hymenio 
pallido-fusco, paraphysibus distinctis. Spore hyaline mox fusce 4-cellule, 
cellulis limbatis, longit. 0*019 mm., crassit. 0:008 mm. 
Ad cortices arborum. 
24. Odontrema concentricum, Stirton. 
Thallus cinereo-ochraceus tenuis continuus. Apothecia matrice impo- 
sita a thallo leviter irregulariterque obtecta, primo clausa, perithecio carbo- 
naceo dimidiato ambitu recurvato mox dilaniato-dehiscente, hymenio tandem 
concavo-discoideo ; epithecium perithecio divulso obsitum, paraphysibus sub- 
tiliter capillaribus apice non dilatis linea fusca tenui enatis. Spor in ascis 
eylindraceis incolores normaliter cylindrace obtuse nonnihil elongato-fusi- 
formes, circiter 12-septate, cellulis quaternis v. lentiformibus, longit. 0:08 
ad :05 mm., crassit. 0:006 ad :009 mm. 
Ad cortices arborum. 
EXPLANATION OF PLATES XXXIX—XLI. 
Puate XXXIX. 
No. 1. Pilophoron 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. Myriangium duriei, Mont. et Berk. 
(a.) Section of carbonized torus and apothsoium s x 38 diam. 
(b.) 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. 
