Knieut.—On the Lichenographia of New Zealand. 377 
44. Platygrapha myriommata, Kn. 
Thallus albido-viridi-einerascens v. albo-cinerascens minute areolato- 
granulosus sub-indeterminatus. Apothecia prominentia a thallo albo ocellato 
pretexta—in initio alia abortiva, disco atro sepe in centro albo intus car- 
bonaceo, partim fecunda tum plana v. convexa ferruginosa demum tenuiter 
a thallo prætexta ; hymenium fusco-rubicundum hypothecio nigro enatum ; 
excipulum proprium nullum ; paraphyses breves ambigue implicatæ non- 
discrete. Spore in ascis clavatis aciculares utrinque attenuate recte v. 
subcurvatz 8-5 septate v. simplices, longit. *04, crassit. -0025 mm. 
Ad cortices arborum. 
45. Platygrapha mecistospora, Kn. 
Thallus albo-cinereus v. albo-glaucescens rimuloso-areolatus v. con- 
tinuus. Apothecia lecedeiformia (diam. 0°7 v. minora) nigra intus fuscen- 
tia v. rubro-fuscescentia, juniora innato-emergentia concava dein adnata 
plana v. convexa exeipulo proprio (perithecio) atro-fusco integro marginata, 
epithecio fusco grumoso indurato (excipulo proprio continuato), paraphysi- 
bus discretis subtilissimis ramosis apice grumosis excipulo atro enatis. 
Spore in ascis elongato-cylindraceis aciculari-cylindrice 16-85-septate, 
longit. 0-18, crassit. -0085. 
Ad cortices. 
Lecidea pleistophragmia, Nyl. in litt. 
46. Verrucaria leptostegia, Kn. 
Thallus cinerascens areolato-diffractus indeterminatus. Apothecia semi- 
immersa minuta globosa; perithecium nudum atrum convexum v. hemi- 
spherieum ; paraphyses graciles discrete amphithecio tenui dilute fusco 
oriunde. Spore in ascis cylindraceis oblonge v. fusiformi-oblongse v. 
obovate dilute luteole, longit. 02, crassit. 006 mm. 
Spermagonia immersa minuta globosa; spermatia oblonga v. linearia 
4-septata, longit. 018, crassit. 004 mm., conceptaculo tenui oriunda. 
Itis not absolutely certain that the spermagones, described above, belong 
to V. leptostegia. Hitherto I have failed to find apothecia and spermagones 
on the same thallus, except in the specimen from which the above descrip- 
tion is drawn, and even in this instance they are not thoroughly mixed 
together, while the thallus on which the spermagones were found is cer- 
tainly of a somewhat lighter tint than the portion bearing apothecia, 
although in every other respect it is uniform. This scarcely perceptible 
difference in depth of tint is not of itself important. "The spermatia, it will 
be seen, resemble in every respect those of Verrucaria byssacea (vera), Scher. 
(vide Leighton’s figure No. 4, Plate XVI., Angiocarpous Lichens); but 
differ widely from the simple spermatia found on Scherer’s-own specimen, 
No. 286, Lich. Helv. Exsice. 43 
