243 



Localities. Lf : Thyboi'0n; Nyli0bing; LQ, Lendrup Ran; MK, Holmtunge Hage; F, Lunde Hage; 

 ML, Gjols Bredning; stone reef west of Draget; Hals. — Ku: TP, Tenneberg Banke; TG. near Syrodde 

 Pynt. — Km: BO, Stensnajs; EZ and XC, south of Ltesa. — Ks : NL, Isefjord; Lammefjord; Holbak 

 Fjord. — Sa: Besser Rev, Samse, partly on Ruppia; MT, Horsens Fjord; Odense Fjord (C. Rosenberg). 

 — Sf: Nakkeb0lle Fjord; Svendborg; U, Birkholm; EA, north of Rudkabing. — Sb : Munkebo, Kertinge 

 Nor; Avernakhage by Nyborg. — Sin: CM, Kragentes; CO; CR, off Dyrefoden ; Guldborgsund. 



2. Melobesia subplana sp. nov. 



Crusta orbicularis, 1 — 2 mm diametro, in statu adulto non nisi margine angu- 

 sto monostromatico, ceterum 2—6 cellulis crassa, cellulis in parte marginali c. 7 — 8/^ 

 latis, cellulis corticalibus rotundatis, in sensu radiali paulo elongatis, trichocytis 

 intercalaribus. Fila verticalia partis frondis crassioris cellulis longitudine vario, 

 6 -9/^ crassis constituta. Conceptacula sporangifera dense posita, paulo prominula, 

 diametro externo c. 150 — 200 /^, interno 70 — 105 //; sub conceptaculis 1 — 2 strata 

 cellularum vegetativarum ; tectum subplanum, c. 2 —3 cellulis crassum, ostiolo cellulis 

 paulo horizontaliter elongatis, non erumpentibus, vestito. Columella centralis conica. 

 Sporangia 42 — 60 // longa, 26—32 // lata, semper disporica. Conceptacula mascula 

 parva, immersa, nonnunquam tubo longo prorumpente munita, fundo cellulis sper- 

 matogenis numerosis elongatis, leniter curvatis, e straLo cellularum rotundatarum 

 egredientibus, vestito, spermatiis longis, clavatis, leniter curvatis, c. 11 j). longis, c. 

 2 p. crassis. Sub conceptaculis masculis 1 — 3 strata cellularum vegetativarum. Con- 

 ceptacula feminea parva, immersa, initio non prominula, stratis cellularum vegeta- 

 tivarum 1 — 3 suffulta. Cystocarpia non certe cognita. 



The specimens which have served as base for this new species were collected 

 near Horsens at the east coast of Jutland, growing on Zosfera-leaves. They have 

 been determined as M. Lejolisii typica by Foslie, and certainly resemble this species 

 very much; they differ however so much from it in some respects that I have 

 thought better to regard it as a distinct species. 



The frond is polystromatic with the exception of a narrow marginal zone. It 

 consists otherwise of vertical cell-rows composed of 2 to 5 cells, not including the 

 small cortical cells, which are cut off by oblique walls. Near the border, the cor- 

 tical cells are seen to be rounded, narrow, usually a little lengthened in a radial 

 sense, sometimes placed not over the anterior border but over the middle of the 

 cell (fig. 160 A). Hyaline hairs are sometimes numerous, given off from cells without 

 cortical cells, also from the polystromatical part of the frond. The cells of the ver- 

 tical cell-rows are of varying length. There is less contrast between the basal 

 layer and the perithallium than in M. Lejolisii, the upper wall of the cells of the 

 former falling not always at the same level, the cells thus being of somewhat varying 

 height. While in M. Lejolisii the intermedial layer in thicker crusts consists only 

 of one layer of long cells, it is in M. subplana usually 2—4 cells thiclc, its cells 

 varying from 1 to 3 diameters in height, shorter and longer cells alternating ii re- 

 gularly, and the transvei'sal walls falling at different levels in the different filaments. 



31* 



