Analysis of the type material of Synedra deformis W. Sm. and Synedra vaucheriae var. deformis Grunow (Fragilariaceae, Bacillariophyta) Author De, Bart Van Meise Botanic Garden Meise, Research Department, Nieuwelaan 38, 1860 Meise and University of Antwerp, Department of Biology - Universiteitsplein 1, B- 2610 Wilrijk bart. vandevijver @ plantentuinmeise. be (corresponding Author Vijver Belgium) - ECOBE, (Belgium) author) Author Mertens, Adrienne Diatomella, IJkelaarstraat 3, 6611 KN Overasselt (The Netherlands) adrienne @ diatomella. nl adrienne@diatomella.nl Author Ector, Luc Luxembourg Institute of Science and Technology (LIST), Environmental Research & Innovation (ERIN) Department, 41 rue du Brill, L- 4422 Belvaux (Luxembourg) luc. ector @ list. lu ector@list.lu text Cryptogamie, Bryologie 2020 2020-11-12 20 13 137 149 journal article 10.5252/cryptogamie-algologie2020v41a13 1776-0992 7819101 Fragilaria candidagilae Almeida, C.Delgado, Novais & S.Blanco , type population ( Fig. 3 ) Basionym: Fragilaria candidagilae Almeida, C.Delgado, Novais & S.Blanco in Delgado et al. , Phytotaxa 231: 3, figs 2-39 (2015). MORPHOLOGY LM ( Fig. 3 A-R) Frustules in girdle view rectangular, solitary or two cells linked together (Fig. 48). Valves elliptic-lanceolate with convex or parallel margins in larger specimens, strictly convex margins in smaller valves. Valves occasionally irregularly shaped. Shoulders distinctly developed with clearly protracted, capitate to rostrate (in smaller specimens) apices. Valve dimensions (n = 25): valve length 11-23 µm, valve width 4-5 µm. Axial area very narrow linear, almost not widening towards the central area. Central area small, clearly asymmetrical due to absence or shortening of striae on one side, forming an asymmetrical fascia. Striae parallel throughout, becoming weakly radiate near the apices, 12-14 in 10 µm, often irregularly spaced. Areolae not discernible in LM. FIG. 4. — Fragilaria joachimii Kahlert. Images taken from the type material (Strain TCC887 isolated from BrostrÖmmen near Norrtälje, Sweden): A -R , LM views of the population arranged in decreasing length; S , T , LM views of several frustules connected to form long chains in girdle view; U , SEM external view of several frustules in girdle view connected via mucus (indicated by the arrows ); V , SEM external view of a frustule in girdle view showing the girdle bands and the mantle plaques. Note the small spines and granules near the valve face/mantle junction; W , SEM external view of an entire valve with scattered small spines on the margin; X , SEM external detail of a valve apex with the rimoportula and the apical pore field. Scale bars: A-W, 10 µm; X, 1 µm. SEM ( Fig. 3 S-W) Girdle composed of several open, perforated copulae ( Fig. 3S ). Large, irregularly shaped mantle plaques present on the mantle edge ( Fig. 3S ). Mantle striae continuing from the valve face till halfway the mantle edge ( Fig. 3S ). Striae uniseriate, composed of very small, rounded areolae ( Fig. 3 T-U). Virgae between the striae very weakly raised to flat ( Fig. 3V ). One rimoportula present at one apex, in line with the before last stria at the apex ( Fig. 3 T-V). Apical pore field present at both apices, relatively large, composed of up to five rows of relatively large, rounded to squarish pores ( Fig. 3V ). Spines never present. Internally, rimoportula distinctly present at one apex, superimposed on one of the final striae at the apex, weakly oblique ( Fig. 3W ).